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.
muddy middy mud midday maud moody meoued mayday mid mad med meadowy miaoued mut mod modi mode maut midi meed mead maid made mity mood mute mutt
buddy cuddy muddy duddy ruddy fuddy faddy widdy rudd toddy noddy biddy daddy gaudy soddy caddy middy neddy paddy kiddy sudd giddy didy eddy teddy midday waddy baddy shoddy