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.
fritz frits fruits fritts frites ferities ferrites faradize forts farts frats frets fortes fortis ferrets forties fretsaw veritas verites faradise ferrates variates verities varieties
fritz ritz ritzy writs bortz brits frits hertz crits grits quartz merits nertz territs worrits
fritt frit fart ferity fort forte forty frat fret fretty fried fruit fruity afrit