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.
board bard bared barde broad beard boart bored boride barred byroad burd bort bird bred brad bourride braid borty bride breed bread brood brede birdie bready buried barite broody borate baryta baryte birred burdie barret burred hybrid berried barrette brat brit brut
board hoard sarod cord laird garda gourd broad byroad eared tardo feared ward lardy bored ford boart geared card fared fard sored wordy yaird sheared oared shard chored pared chared nard soared whored pardi ordo tared rared lord roared farad road hard dared horde hared beard bared lard teared heard arid hardy bard barde gored cored guard cared sard caird fordo fiord seared reared liard pored tardy orad pard wared moored sord chard pardy chord shaird neared shared shored word yard
boar bar bare barre barrio barrow bear boor bora bore borrow bourree kbar