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.
guls gulls gules guiles gals gullies gulleys gaols glows galls galas gloss glass goals culls glias glues cauls glees gales gleys cullis quells coulis glossy caulis gallus quolls caules quails galeas glossa galahs glassy quills queleas cullies coulees gallies glossae goalies glassie cullays gallous galleys gallows coulisse galleass quillais goalless cols galliass quillaias calos koels glaze glazy coles clues colas cools kohls calls kolos glace kails cloys clays kilos kills kales class coals close kolas keels coils cowls gloze claws clews
fouls ghouls hauls cauls guls mauls miauls puls sauls souls wauls shauls shuls