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.
learn larine lierne lorn loran
learn reearn yearn earn ern carn kern quern wyvern kerne fern heron rerun lierne sarin cairn darn tern warn sharn yarn garni karn bairn barn airn carny ferny hyperon erne barny varna reran hern baron serin tarn terne shairn sharny saran
lear leary lar alar glare lier clary liar flare lehr blear leery alary laurae leer laura lari laree lair laari blare bleary claro clear glary