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.
radar redear raider reader readier rider ruder redry rater rotary ridder redrew rudder retear redder ratter rudery rattier reedier rowdier ruddier
radar chadar madre midair kneader padre cadre redear cedary loader deodara wader leader tatar chador cheddar chuddar deader gaydar lidar beader dare dear header feudary feodary fader deodar nadir padri reader cedar sudary lader chadri cheddary shader
rad roadie trad orad grade grad irade brad roadeo radii road ready readd read raid radio trade