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.
colocate collocate calycate colligate cloaked clocked collect collogued clacked clagged clicked clogged clucked calked
locate allocate collocate colocate reallocate relocate falcate vellicate calycate placate plicate relocatee silicate sulcate delicate
cloaca cloacae clock colic colicky collogue colloquia colloquy colog