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.
furan furane fraena fern firn ferny frena frown farina ferine foreign
buran furan urn ran rain journo grana parian murrain marrano quern guarana ruana rani bourne borane drawn curn reran saurian sierran drain durian terrain train roan bourn shoran purin prawn mourn crane grain durn saran serrano purana pyran bran guarani pirana neuron turn diuron terrane brain loran burn furane groan burin gran brawn curran churn yourn
fur feuar fora foray four frae fray furrow furrowy furry fury