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.
putts puts puttees putties pouts pottos pittas patties pots pits putz pets pats puds potties patsy pates peats poets potsy pitas potsie petsai pities pietas pitsaw patois poetess poetise pieties piteous paduasoy pads peds pods
butts mutts putts uts louts matts huts botts routes cutes cuts bouts bitts mottos rottes suets lottes suttas mutes duets puts beauts sautes pottos batts buts shuts tutus shouts chutes tots watts tets utes butes tats outs tuts mitts bettas autos routs nutsy netts dauts quits fouettes phuts ghettos cottas lottos mauts ruts tuttis lyttas knouts tauts setts dittos dattos mattes utas tits gutsy suits ghauts fyttes muts lutes pouts pittas ottos guts duits touts nuts mottes lattes cutis buttes gouts juts chotts motts shotts shutes jutes yetts
putt puttee putty puttie putto putti put potty petto petti pouty pout patty potto pitta petty pattie pattee sputa