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.
clammier clammer claimer clamber gleamier clamor calmer clumber glummer climber gleamer clamour glimmer calamar calamari calamary claymore gloomier qualmier glamor glamour glomera columbary columbaria
clammier plummier slummier slammer filmier slummer slimier bloomier glummer glimmer gleamier clammer haulmier flummery flamier elmier plumier malmier slimmer loamier limmer limier limbier gloomier qualmier palmier plummer balmier lambier