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.
seamy seam same seem seme semi samba sambo sim som sum sima smew soma some sumo
beamy seamy shammy whammy tammy jemmy mamey loamy lamby gamy gammy gamey gamay mammy beam gemmy hammy foamy emmy rammy seam jammy ream demy team chammy shamoy