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.
dieoffs doffs diffs difs diffuse teffs daffs toffs tiffs dives duffs davies doofus defuse defies deifies toffies toffees divvies devious devs devas divas tuffs defis tofus doves dufus devise device deaves deface defuze devisee devoice diphase taffias taffies
feoffs dieoffs effs offs boffos boffs howffs coffs pouffs doffs teffs toffs efs