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.
senor senora senior snore seiner senary scenery senarii scenario sonar saner sneer sinner sneery sooner sunray synura sunnier
senor tenor nor tenour donor honour teener denar senora noir nori henry honor genre genro canoer keener manor minor pawnor senior junior snore wiener
sen scena scene seen seine sene senna sewn sienna snow snowy