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.
peseta pest pasta pesto pesty peised pst pesade posset past post psst pseud pasty posit posed poussette pissed passed posada poised peaced paused pseudo pistou pieced passado piosity
peseta seta set disseat reset russet suet reseat costa cuesta zeta aceta knesset cesta testa misseat keyset casita basset coset vista fiesta beset bassett mozetta cosset cassata stay pasta hosta asset stoa staw sett setae seat gusset vesta costae miseat misset mozzetta posset reseda roset russety siesta tasset testae
pes peso peeps epees apse apes pose poesy pies pews peise pase pehs pees pease peas paseo opes peps