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.
climber clumber claimer clamber calmer glimmer clammer clammier columbary clamor columbaria clamour glummer glomera gleamer calamar calamary claymore gleamier gloomier qualmier glamor glamour
climber limber slumber slimier plumbery plumber glimmer clumber clamber claimer filmer lumber limmer limier limbier lambier lamber slimmer slumbery