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.
sulcus sulks slacks slicks sulkies silicas silks slags slogs slugs siliquous slakes sleeks salukis sawlogs selkies silkies siliques
sulcus valgus telcos talcs locus relics plugs lilacs glugs glaucous colics vulgus flocs lacs flics blocs beylics alecs lugs slugs talcous taluks shellacs
slack slick soullike sulk sulky suslik