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.
timbral timbrel tumbrel tumbril tumoral demurral
timbral umbral cameral amoral femoral fimbrial humeral moral humoral mural immoral gomeral nombril numeral timbrel tumbrel tumoral gambrel tumbril whimbrel
timbre timarau timber timbery timer