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.
pensees penises pansies hypnoses ponces pounces hypnosis pinnaces
pensees noses manses lenses lionises anises anuses kineses ensues fiancees sanseis bonuses rinses senses hanses zoonoses pansies tennises onuses tonuses minuses finises venuses censes mannoses quinsies linseys guanases joneses kinases geneses ionises genuses gnoses rennases senseis penises sinuses hypnoses tansies nonuses tenses menses unsews
pensee pens peans peens peins pence penes penis peones peons opens spense