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.
nets netts newts neats nuts nits knits nodes nudes gnats nowts nutsy nites notes nides knots needs nates kneads nudies knouts naiades neddies noddies nods nadas nidus nodus wynds
beets keets whets weets duets deets sets poets pets nets meets lets leets quiets jets bets gets hets haets vets fets rets suets diets tets wets sheets