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.
forgo forego farrago fork frag frig frog frug forky froggy virago
sorgo forgo bourg burgoo aerugo ergo erugo farrago forego virago cargo grego largo pargo sargo trigo
for fora foray fore forwhy four afore