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.
quarto quart quarte quirt cart kart curt quarried curet karat guard caret carat kurta carte court carrot quired curite grotto carate garret karate garote cardio curate carroty curette garotte garrote queered querida queried garrotte
quarto art caret cart carte kart quarte hearty mart quart party sarod tardo tart wart whereto carat heart hereto hart rato fart burrito boart arty airt roto karat part peart dart tarot tarty warty chart
quare quarry guar quaere query quire aquaria quackery quackier quaggier quaker quakier square