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.
lessen lesson loosen lysin leucin leucine liaison
lessen sen risen reseen owsen messan loosen lesson quassin gossan cassene cassena casein caisson hosen hausen sewn sene seen ossein peasen resewn chosen
lessee less les lies bless leys lyssa leis lossy loss loess lease lees leas lasso lassie lassi lass lues ales oles