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.
botanies botanise botanize butanes betaines betonies badness butenes biotins boutons battiness bittiness beadiness bawdiness batons betons battens boudins buttons bedouins
botanies litanies tetanies ratanies dittanies butanes titaness betonies tetanise soutanes tunnies mutinies redenies danios denies tawnies phytanes townies tennies neotenies atonies cetanes stanes botanise botanize betaines tetanize toonies titanias
botany botonee botonnee butane