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.
sinhs sins sinus sines sains sinews seines scions sans siennas zins sunnahs sinuous sons suns sanes sunns zeins snaws sensa since snows sonsy sense sones zines cines scenes sanies sennas saunas hysons scenas sunnas sanious sawneys science sonnies zinnias
sinhs ins quins pains linos mynahs mains pians sains joins veins foins pines kines minas quoins minis kains ains hins coins jinns kins pions cines zeins shins chins reins chines chains dinos wins wines tins rinse whines vines tains seines zins vinas vinos ions sinus inns lions cains nines mines fins sines miens kinos cions koines loins liens lines bines peins finos jins quinsy kinas scions gains pinas minus lins linns gins sins pins ruins rins zines fines dins rains wains tines finis whins winos dines chaines chinas bins chinos shines sunnahs yins
sinh sin sain seine sienna sign sine sinew sinewy