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.
womans womanise womanness womanize
mans shamans somans lemans tomans humans limans damans womans romans caimans caymans remans manus cumins mains gnomons moans haemins romanos gamins hymens daemons commons omens bemoans manse limns siemens limens amins domains demons means yamens damianas simians hymns saimins lumens manas hemins remains bemeans lemons muns gammons manos summons damns mons mammons manes amens semens cummins diamins demeans daimons rumens yamuns