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.
basal basally basil basely bassly byssal busily bacilli bossily
vasal nasal basal sal loessial measle missal saul vassal pausal basil sail causal reseal sale deasil teasel tussal wassail resail sall seal resale easel masala phaseal assail measly reassail visual casual loessal sisal byssal dossal tissual usual weasel
bas baas base bass bassi basso bassy bays bias boas abas abase babas babassu obas