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.
lesson lessen liaison lysin leucin loosen leucine
lesson caisson son disown season cession reason passion messan mason boson lessen quassin gossoon gossan foison essoin fission bison meson bassoon mission sown poison soon resown sone scission hyson session liaison weason
lessee less les lies bless leys lyssa leis lossy loss loess lease lees leas lasso lassie lassi lass lues ales oles