I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
hairs hires haars hears heirs hoars hares hearse hirees harass hoarse haeres hers hearsay harrows harissa heiress harries hours heros heres horsy hoers horas horse houris heresy heroes horsey horahs herries hoorahs hoorays hurrahs hurrays hurries
airs lairs pairs hairs vairs wairs fairs chairs deairs mairs ars coirs dares boars liers gars varus kirs birrs carrs tiros hears heirs hires ears laris guiros naris gnarrs varas knars parse parrs lars souaris haars maras vires nairas nears marse hares reraise maars mars nares sirs tares tars tears saros tiers wares wires whirrs charas charrs chiros shiers shirrs years dears shares rares chirus ares fires piers coarse carse noirs fiars wears biros nairus guars jars serais mires pares fares zaires ires cares roars gaurs rais sears faros gears hoarse liars praise firs knaurs fraise bears quires soars virus paris biers cars vars braise feuars hoars moires lares fears bars oars raise hearse gnars lears liras birse cires sires bares mares rears arse giros pears choirs iris mbiras saris kiers pars pharos keirs raias weirs shears whirs taros tarsi terais tires paras mirs wars tahrs viers chares chars chirrs shires tiaras yirrs
hair hairy haar hare harrow harry hear heir hire hiree hoar hoary