See
http://learnyourdamnhomophones.com/
and
https://storiesonline.net/blogentry/49176
Additional homophones
ordinance - law, regulation
ordnance - weaponry, ammunition
serf - worker bound to land, subject to will of land owner (noun)
surf - waves near/on shore (noun); riding wave (verb)
site - location (noun); put in a location (verb)
sight - vision (noun, verb)
taught - past tense of 'teach' (verb)
taut - tight, no slack (adjective)
Tricksy word duos
arraignment - answering a criminal charge in court (noun)
arrangement - agreement; plan made in preparation (noun)
cloth - short vowel sound, rhymes with moth - fabric (noun); sometimes small pieces (e.g., washcloths)
clothe -- long vowel sound, rhymes with loathes - to dress something or someone (verb)
clothes - apparel, clothing (noun)
eminent - noteworthy, famous (adjective)
imminent - happening very soon (adverb)
loath - hard th sound - REALLY do not want (adjective) - "I am loath to let the car go for less than $5000"
loathe - soft th sound - hate (verb) - "I loathe insincerity"