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.
postin pastina posteen postteen piston
postin boston teston destiny destain sestine cystine hasten pastina stain stein stun zeatin acetin satiny satin fasten isatin isatine listen mestino moisten neuston piston cystein sestina sustain destine distain chasten
post postie pst posset pest psst pasta piosity paste pastie pasty pesto posit piste poussette past pistou poised posada posed pesty