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.
ruffly ruffle refly ruefully rifely raffle riffle rueful roughly refel rifle reflew refall refill refell reflow refile refeel refuel ravelly
waffly ruffly fly shoofly wifely deafly refly daffily sawfly goofily raffle puffily piffle offal muffle mayfly liefly flay baffle huffily fley chiefly whiffle duffle beefily waffle dayfly duffel safely riffle coffle ruffle rifely souffle shuffle
ruff ruffe raff raffia riff gruff gruffy truffe