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.
pst past pest post psst pesto pasty paste pasta posit pesty piste postie posset pistou pastie peseta piosity posed poussette pseud passed paused peised pesade pissed poised posada pseudo