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.
gallop galop glop calliope collop gloppy clop gulp callipee gulpy kalpa calipee
gallop dollop lollop shallop collop wallop lop lollopy loop slope bloop sloop elope pullup fillip galop flop loup jalop plop jalopy saloop clop slop lope glop
galley gally gall gal gaol gully galeae gull galea goalie gale gayly calla galah callee call goal gala golly gaily gulley callow egal