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.
unites unities units undies unties unitize undoes
nites dunnites finites unites gunites kainites gahnites dunites sienites reunites pinites lenites mannites bonitoes kainits lunettes punties keynotes neonates joints vanities countess quints monodies annates paints pointes lindies feints aunties manitus panties phenates randies canities manitos phonates knits hints suints dinettes shindies shanteys chints chanteys units sennits tonettes tinnitus tannates hymnodies donates sinuates candies dandies banties nates cenotes lenities bints hyphenates quintes nides binits lints pontes nits neddies giantess pints contes minutes bonitas senates annuities bonitos montes noddies nudies genettes points manatees bounties notes kentes rentes nineties indies enates maundies mantes faints penates pintoes gentes snits ruinates haints counties sanities connotes coonties mentees saints undies mints pandies dainties bandies denotes dints antes taints tenuities tints unities unties chanties shandies shanties yentes