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.
portal portly parietal partly pertly protyl peartly prattle predial pretell protyle peridial praedial prettily proudly predella
artal hartal aortal mortal portal curtal cartel retail rattail ritual peartly marital rotl hurtle tartly kirtle parietal artel shirttail ratal whortle curtail chordal chortle pertly brutal turtle curtly varietal virtual partly dartle myrtle courtly portly shortly
port pretty sport spored aport purty prutah pruta protei protea prate part prat poured pored pert party sporoid sporty