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.
muttered mattered metered mitered metred mitred matured motored meteorite meteoroid maturate
bettered tottered pottered muttered chattered waitered metered guttered loitered littered battered cottered buttered fettered reuttered bittered jittered tittered yattered shattered mitered shuttered uttered gettered neutered puttered catered lettered tattered pattered petered watered nattered mattered teetered chittered treed tired tiered natured teared deterred laterad motored trued tutored retired stared retried tyred sutured powdered laddered teddered mitred metred tread tared retread tried outread matured juddered featured steered attired teredo chowdered foddered shuddered doddered stored hatred
mutter matter mattery muter smuttier