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.
hardy hard hared heard hoard hairdo haired hearty hart hayride harried herd heart hired horde heired horrid herried hurried hurt
hardy lardy pardy tardy wared shaird tared weirdy barde teared cared caird hoard bready pardi farad heard lard guard reared yaird shared laird corrody bared bard liard neared oared pared party rared roared sarod soared garda tardo chard arty fard shard hard wordy sard ward faraday beard eared parody perdy ready board geared card tarty chared arid seared grody hearty pard nerdy nard curdy sheared corody dared hared feared fared warty yard
haar hair hairy hare harrow harry hear hoar hoary