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.
labor labour labra labara liber libri lobar libber lobber lubber lowbrow
labor tabor labour taber sabre sabra sabir saber rebore labra boar kabar caber abri bore bora boor tabour
lab labia lobo blab blabby elbow flab flabby slab