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.
labors labours laborious libers libbers lobbers lubbers lowbrows libras
labors tabors bros boors gabbers goobers cobras nabbers lubbers bores rebores cabers gibbers sabers robbers sabras jabbers libras sobbers bars debars webers tubbers subers hobbers dabbers bras bris boars boras dibbers dobras kbars dubbers libbers jibers gibers libers rebars sabirs ribbers rubbers hubris jobbers jibbers lobbers debris mobbers cobbers gabbros cubers burs hybris tabers fibers sabres tabours labours dobros kabars dobbers bobbers abris kebars daubers bibbers zebras fibres sobers fibbers tubers yabbers
labor labour labara labra blabber flabbier clabber slabber slabbery