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.
gamma gama gamay gumma gamba gammy gam gambia gamb gaum game gamy comma gambe gamey gummy caeoma cambia cammie cam gum came camo coma kame kami
mamma gamma ama chammy whammo gamba zamia gamay summa gama rammy jammy mammy lemma comma lama gumma gammy hammy gemmae ammo whammy tammy summae samba momma mama mammae mamba llama lamia amah amia gemma shammy