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.
seaman seamen semen soman saimin simian semina simony simoon somoni summon someone symbion zoomania
daman seaman shaman man immane maun many mano mane bowman human gamin diamin bemean layman main moan simian mana ramen demean domain woman showman yamun cayman liman remain toman roman bayman reman romano amain amen amin damn bemoan mawn foeman mean caiman cowman lawman seamen soman leman humane yamen yeoman
seam seamy samba sambo same seem seme semi sesame