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.
luffas luffs loofas loofahs lavs luvs lavas laves leafs loafs loofs laighs laughs leaves loaves loughs
luffas fas jiffs caffs coffs cuffs gaffs guffs huffs quiffs loofas feoffs loofahs luffs mafias piaffes ofays pouffs raffias riffs ruffs daffs diffs duffs tafias tiffs tufas waffs chaffs chuffs muffs howffs buffs offs buffos fays bouffes boffs boffos biffs quaffs baffs coiffes gaffes guffaws effs maffias naffs miffs pouffes puffs raffs ruffes sofas dieoffs doffs taffias teffs toffs tuffs whiffs chufas yaffs
luff luffa bluff fluff fluffy sluff