The /d/ sound is spelled with <d>, <dd> or <de>, and the /m/ sound is <m> or <mm>. Notice how the homograph do makes pairs with with mow and moo.
The contrast is between a voiced stop and a nasal continuant, well separated in the mouth. It is not a problem for learners.
The only mildly taboo word pair is bud/bum.
Interesting pairs include:
Airedale airmail
bantered bantam
bordered boredom
custard custom
deadly medley
diesels measles
dorsal morsel
faddily family
haddock hammock
inferred infirm
murder murmur
perdition permission
The mean density value is 2.9%. The list makes 298 semantic distinctions, a loading of 62%.
ad am add am addition omission additions omissions adieux amuse aid aim aiding aiming aids aims Airedale airmail ardour amah ardours amahs ardour armour ardours armours baa'd balm bantam bantered bard balm bead beam beading beaming beads beams betides betimes blade blame blades blames blued bloom booed boom bordered boredom breed bream brewed broom brood broom broods brooms bud bum budding bumming buds bums bunkered bunkum cad cam cads cams cadre calmer cadre karma cadres karmas card calm carding calming cards calms cawed corm cede seam cedes seams ceding seaming cede seem cedes seems ceding seeming charred charm chattered Chatham chide chime chides chimes chiding chiming chord corm chords corms Christmastide Christmastime Christmastides Christmastimes crowed chrome clad clam coda coma codas comas code comb codes combs coding combing collared column cud come conferred confirm cord corm cords corms creed cream creeds creams cried crime cuddly comely cuddlier comelier cuddliest comeliest custard custom custards customs D me dace mace dad dam dads dams dad damn dads damns dad mad daddy Maddy dairy Mary daisies mazes dale mail dales mails dam ma'am dame maim dames maims damn ma'am Dan man dandy Mandy Dane Maine Dane main Danes mains danger manger dangers mangers dangle mangle dangled mangled dangles mangles dangling mangling dare mare dares mares dare mayor dares mayors dark mark darker marker dart mart darts marts dash mash dashed mashed dashes mashes dashing mashing date mate dated mated dates mates dating mating daughter mortar daughters mortars daughterly mortally daw maw daws maws daw more dawn morn dawns morns dawn mourn dawned mourned dawning mourning dawns mourns dawning morning day may days maize days maze daze maize daze maze dazed mazed dead Med deadly medley deal meal deals meals dealt melt dear mere dears meres dearly merely dedicate medicate dedicated medicated dedicates medicates dedicating medicating dedication medication dedications medications deed deem deeds deems den men Denny many dent meant dental mental dew mew dew mews dews muse dhow mow dhows mows Di my diary miry dice mice Dick Mick Dicky Mickey did dim did mid diddle middle diddles middles diddling middling die my died dime diesels measles digit midget digits midgets dike mike dikes mikes dime mime dimes mimes dine mine dines mines dining mining dined mined dined mind diner miner diners miners dingy mingy dingier mingier dingiest mingiest dingle mingle dingles mingles dint mint dints mints dire mire dirge merge dirges merges dirk murk disc misc distrustfully mistrustfully dixies mixes do moo do's moos doing mooing do mo do mow do moo doe mo doe mow does mows dough mo dough mow dour moor doe mow does mows dock mock docked mocked docking mocking docks mocks docker mocker dockers mockers dole mole doles moles doled mould doll moll dolls molls Dolly Molly dolt moult dolts moults door maw doors maws door more dope mope doped moped dopes mopes doping moping Doreen Maureen Doris Maurice dorsal morsel dosed most doss moss dosses mosses dost mussed dotard motored dote moat doted moated dotes moats dote mote dotes motes dottle mottle dottles mottles Doug mug douse mouse doused moused douses mouses dousing mousing downed mound dozes moseys duck muck ducked mucked ducking mucking ducks mucks ducky mucky dud dumb dud mud duds muds dude mewed Dudley dumbly due mew dues mews duffel muffle dug mug dugs mugs dull mull dulled mulled dulls mulls dulling mulling dumber mummer dumps mumps dunk monk dunks monks dusk musk dusky musky duskier muskier duskiest muskiest dust must dusts musts duster muster dusters musters dusty musty dustier mustier dustiest mustiest Dutch much dyer mire dyers mires Ed M edition emission editions emissions elude illume eludes illumes faddily family fade fame fed fem feeder femur feeders femurs feud fume feuds fumes filled film flayed flame fled phlegm ford form fording forming fords forms frayed frame gladder glamour glued gloom gnawed norm grid grim had ham haddock hammock hard harm hawed haulm head hem heading hemming heads hems headline hemline headlines hemlines held helm hid him hoard haulm hoards haulm hoed home horde haulm hordes haulms I'd I'm inferred infirm James jades lad lam lads lams lad lamb lads lambs lade lame lading laming larder lama larders lamas larder llama larders llamas leader lemur leaders lemurs leading lemming lidless limbless lied lime lingered lingam load loam loads loams lode loam lodes loams mad ma'am made maim maid maim maids maims meadow memo meadows memos myriad Miriam mud mum muds mums muddy mummy muddies mummies murder murmur murdered murmured murdering murmuring murders murmurs neighed name node gnome nodes gnomes ode ohm odes ohms pad Pam perdition permission pod pom pods poms pommel puddle pommelled puddled pommels puddles pride prime prides primes priding priming prod prom prods proms purred perm read ream reads reams reads Rheims rid rim ridding rimming rids rims ride rhyme rides rhymes riding rhyming ride rime road Rome road roam roads roams rood rheum rood room roods rooms rod rhomb rods rhombs rode Rome rode roam rude room ruder roomer rowed Rome rowed roam rudder rummer ruddy rummy Rudy roomy Ryde rhyme sad Sam ski'd scheme screed scream screeds screams scud scum seed seam seeds seams seeding seaming seed seem seeds seems seeding seeming seedy seamy seedier seamier seediest seamiest seedless seamless shad sham shade shame shades shames shading shaming skid skim skidding skimming skids skims slid slim slide slime spewed spume springtide springtime springtides springtimes spurred sperm stead stem steed steam steeds steams stored storm suds sums sward swarm teed team teed teem third therm thirds therms thud thumb thudding thumbing thuds thumbs tide thyme tide time tides times tiding timing tidings timings toad tome toads tomes Tommy toddy trad tram ward warm wards warms warding warming warder warmer warders warmers whirred worm who'd whom word worm words worms wording worming wordy wormy wordier wormier wordiest wormiest
John Higgins, Shaftesbury, February 2010.