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.
seed seedy sued suede setae suttee settee sod zed set sad side site said soda sadi sudd seat stey sidh stew cede sate cedi cete seta sade suet sett saute soddy stewy stoae suety suite
feed heed geed jeed cooeed meed kneed need peed reed seed deed teed weed ed