let vs letter

let and letter both are nouns.

Word	Noun	Adjective	Verb	Adverb
let	Yes	No	Yes	No
letter	Yes	No	Yes	No

let (noun)	letter (noun)
a serve that strikes the net before falling into the receiver's court; the ball must be served again	a written message addressed to a person or organization
	the conventional characters of the alphabet used to represent speech
	an award earned by participation in a school sport
	a strictly literal interpretation (as distinct from the intention)
	owner who lets another person use something (housing usually) for hire

let (verb)	letter (verb)
leave unchanged	mark letters on or mark with letters
cause to move; cause to be in a certain position or condition	set down or print with letters
actively cause something to happen	win an athletic letter
consent to, give permission; permit
grant use or occupation of under a term of contract
make it possible through a specific action or lack of action for something to happen