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.
phasis phases physis ghazis physes vases fasces feases phizes ghazies
phasis basis oasis sis assais cases sassy seis gases niseis lassis physis lysis casus bases missies sass eases gnosis isseis nazis baases hissies pases poesies poussies pussies ceases sassies daisies diesis teases whoosis wiseass chases oases missis lases kneesies masas vases easies biases meiosis feases cassis ghazis cosies gussies lassies leases casas phases miosis newsies cissies wussies whosis tussis tassies dassies sissies rases busies psis posies peases bossies hussies noesis chassis