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.
slick salic slack silica sulk sawlike silk soullike seallike silky sulky slake sleek celiac saluki sleeky selkie silkie siliqua silique siliquae slag slog slug
lick rollick cowlick slick flick klick killick click melic relock laic iliac flack folic relic salic pollock oleic klik flic pulik jawlike pealike raylike luck clack malic hoelike sawlike shylock shellack wheylike toluic telic talcky doughlike hillock owllike silica pollack plica cluck beylic gallica plack lawlike clock fleck coeliac lack gallic beylik veillike rollicky rowlock colic calico bullock beelike celiac maiolica slack flock pluck seallike black phylic alike quaylike mullock aulic alack like killock eellike bowlike colicky bowllike heliac belike phallic lock block soullike taillike tealike toelike toylike woollike shlock sialic