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.
tensity density tenacity tennist teeniest tonicity tanist tensed dynasty tannest tiniest toniest tawniest tinniest
tensity density nasty venosity vinosity honesty lanosity mainstay nonsuit hyponasty sinuosity sunsuit dynasty
tens taenias teens teensy tenias tennies tennis tense tenuis