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.
sinuous sinus sins sanious sinhs snows sains sines scions seines sinews siennas sons zins sans suns sonsy sensa cines zeins sense sunns sanes snaws zines sones since sanies saunas snoozy sunnas snooze scenes sennas hysons scenas sawneys science senecio sonnies sunnahs zinnias
sinuous tenuous nous aeneous venous vinous heinous nouns ruinous sanious nos nus