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.
spoors sapors sopors spores sapours spurs spars saporous sprues spares spiers sprays speers sparse spires spears supers speirs sprees spireas sappers sippers suppers soapers spurreys spiraeas spurries spurious sporozoa sparrows suppress sapphires spruce sprucy zappers zippers
spoors pooris pores pours vapors vapours repours sapors sapours sopors spores
spoor sapor sapour sopor spore