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.
sisal sizzle sassily saucily sessile scissile
sisal sal visual isle casual lisle loessial missal resail pausal reseal phaseal resale dossal tussal wassail vassal byssal vasal causal sail assail aisle seal saul sall sale reassail loessal masala nasal basal tissual usual chisel
sis seis seise sissy assais assays essays visas misassay psis seises sises sisses sissies