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.
force farce fores farcie fierce foresee foresaw feres fares froes furze farcy fires farci fours frise froze frees fries freeze frisee frieze fraise forays furies faeries fairies ferries phoresy firs friz furs
force fores source price pierce mores ores gorse gores corse grace cores coerce truce trace worse tores shores terrace horse fierce lores tierce terce sores pores morse orrice rice bores race brace farce farcie whores trice chores torse yores
for fora foray fore forwhy four afore