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.
guard garda gourd garred gourde gardai grid grad card curd quarried curdy grody cured gored gride greed grade cared caird quart quarte quarto garret caried cardia greedy cardio quired curred garote garotte garrote queried carried queered curried cardiae garrotte cart grat kart cred crud curt cord grit grot
guard urd sard reared turd lured farad eared laird lurid gourd hared neared curd cured geared purda pared pardi dured ward sciurid yaird shared feared shaird chard hardy soared lardy heard teared surd loured fared hard tardy oared card murid pard poured rared caird garda pardy nard bard curdy gourde lard quart barde arid cared sarod roared beard nurd toured liard tared tardo bared burd mured soured board fard seared wared chared dared shard sheared hoard yard
guar gar gaur guiro gurry guru quare quarry agar