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.
cions scions cines zins sins sons sonsy zines sines sinus zoons cense sains zeins sinhs sones zones seines hysons sonsie scenas scenes sinews senecio siennas sinuous sonnies sanious zinnias science sans suns
ions cions pions scions lions ons ins minis fines kins quinsy mines cones johns finis quoins eons coins mains mons rins minus pines lins phons jins lines vinas koines loins peons hons boons phones onus danios paeons rains tones pons pinas nouns monas ones seines towns sins tains tines whines wines sines wins sones zones chaines chinas chinos zines shines dinos yins tonus sonsy moons liens coons kinos gins donsy donas fons vinos linns minas jones goons poons linos hones pones nones peins quins veins loons hysons loans nonas cines roans moans inns peones pins dines owns ruins tons leones kains finos cains jinns bones fohns ains aeons phonos miens conns foins sanious kinas koans cons kines joins kaons sains rinse reins pians conus neons knowns monos nines downs dons bines pains onos bonus vines gowns noons fins hins bins gains muons zeins zoons toons sinus tauons tins whins winos sinhs wons wains sons chains chines chins zins shins dins yonis