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.
tits toits titis tats tuts dits tets tots titties tauts dites teats tides toots doits tutus ditsy ditas totes tates touts diets duits duties tutees tuttis tidies dattos teiids tootsy todies dittos tatsoi tattoos deities dawties teddies tedious toddies tutties tootsie tatties ditties toadies dauties tods tads dots ditz teds tatouays dawts toads didos deets dauts duets dates dotes ditzy datos doats
aits quits chits whits toits duits dits suits writs pits nits knits lits quoits kits baits gaits gits its hits fits bits sits zits doits tits waits wits shits