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.
maftir mightier
maftir fattier shifter weightier tuftier defter softer rafter footier after hafter hefter heftier lefter lifter lofter loftier mightier naughtier niftier ofter poofter sifter dafter tufter wafter wiftier shiftier