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.
season session sasin seisin cession scission sozin seizin sozine
reason mason weason season son foison disown resown fission peasen essoin poison passion meson lesson gossoon caisson basin sown soon sone liaison hyson bassoon mission cession boson scission azon sasin session bison
seas seis teases seesaws sasses reassess oses feases eses easies eases sues sews seise seesaw cease sees says saws sassy sass leases peases ceases sassies seises uses