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.
ombre omber omer
hombre timbre ombre sombre umbra demure imbrue mare lamber cumber camber immure tambur chamber embar lumbar bomber bemire member sambur ember mire daymare mimbar amber umber embrue mere ambry more somber sambar lumber limber umbrae mure number gambir comber omber dumber timber chimere