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.
garda gardai guard cardia garred grid grad cardiae card gored gourd karat grody greed caird grade carat gride cared cardio greedy carate garote garret caried gourde karate corrida querida garrote carried garotte quarried garrotte cord crud grot grit grat curd kart cart cred
garda farad nard pardah karat laird gardai purda pardy rared cardia corrida giardia sarod roared soared carat barde tardo bared tared hoard ward board chard eared shaird beard shared lardy yaird oared arid fard caird liard pard guard querida bard pared pardi purdah card cared geared sard reared seared hared faraday dared hardy tardy heard teared feared wared fared chared hard shard lard sheared neared yard