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.
sambur sambar samurai samara seamer somber sombre seamier smear simar seemer simmer smeary summer summary summery zamarra zamarro
sambur tambur murr ombre number member lemur gambir lumbar sambar mura amber amour bomber dumber demur embar ember timber tumour umbra ambry rumour cumber mure somber comber omber mimbar lumber lamber femur limber camber tambour immure humour hombre demure sombre tambura timbre umber chamber