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.
umbra umbrae umber
umbra embar limber lumber mora mura gambir ambry bomber amber dumber tambura timbre somber femora sambar womera remora woomera omber chambray mimbar mbira mara tambur lamber lumbar comber camera cumber hombre fimbria camber sombre timber ember sambur umber samara umbrae ombre wommera number chamber member chimera