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.
unties unities undies unites unitize units undoes
aunties vanities lenities unities sanities panties dainties coonties nineties punties shanties chanties annuities counties bounties tenuities banties unties canities countess pointes bandies candies montes pinites nites monodies mannites tannates unitize pintoes quantize cenotes neddies nates mantes sanitise gahnites lindies reunites kainites sonnetize shindies shantihs chiantis chanteys tonettes dunites dinettes dandies shanteys lunettes scientize unites antes mentees manatees monetise connotes pandies monetize sienites mantis gentes sinuates phonates noddies penates maundies neonates finites annates entice nudies notice enates bonitoes giantess antis lenites hypnotize intis notes keynotes quintes denotes randies dunnites ruinates pontes gunites minutes hyphenates hymnodies rentes kentes indies contes donates undies senates phenates nides genettes shandies sanitize shantis yentes