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.
gloomier glomera gleamier gleamer glimmer glummer qualmier clammier calmer glamor claimer clamber clammer climber clumber glamour clamor
bloomier gloomier slummier plummier palmier qualmier lambier limbier limier loamier balmier bloomer bloomery elmier filmier flamier haulmier clammier gleamier glomera malmier plumier slimier telomere
gloom gloomy glom glioma gloam