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.
mantle mantel mannitol mantilla mental mandala mandola mentally minutely monadal
gentle cantle mantle wintle pintle hantle faintly phenetole quantile handle quintile gentil kindle quantal quintal lintol fontal kantele pentyl pontil riantly cental saintly dandle dentil until windle quaintly pantile mental mantel bindle auntly nettle jointly cantal candle lintel inutile lentil gentile fondle hondle gauntly rental rundle centile santol dental dindle wandle gently bundle
manteau manta mantua maundy amanita maund moaned mannite mint manned menta meant manitou manitu manito maned manatee manat maenad mentee minty monte emanate