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.
sentry senator century centaury sanitary center centre sender sundry santur santir sinter centra santera saunter santour centare santero centaur santoor ceinture santeria sanatoria centaurea sonneteer sanitaria sanitoria snider sonder sunder sander cindery sandier sounder snootier snottier snoutier
entry pantry country gantry sentry gauntry chantry gentry reentry wintry century hunter kantar chantor daunter foundry saunter renter centra sinter mentor minter canter vanitory quainter hinter monitory sundry quintar shunter chaunter notary gyniatry banter contra vaunter tinter bunter counter tantra tenter santir unitary santur taunter cointer monetary enter antre wintery reinter gaunter centre cantor haunter mounter sanitary wanter laundry antra minatory lientery intro winter linter reenter qintar painter punter venter jointer pointer nitery punitory mantra fainter ranter chanter inter center chunter yantra
sente sent senti snot sienite cent centai cento centu santo scend scent send seniti sennet sennit seined snit senate snotty