take down vs let down

take down and let down both are verbs.

Word	Noun	Adjective	Verb	Adverb
take down	No	No	Yes	No
let down	No	No	Yes	No

As verbs, take down and let down are synonyms defined as:

Other synonyms of take down include bring down, get down, lower.

take down (verb)	let down (verb)
make a written note of	fail to meet the hopes or expectations of
tear down so as to make flat with the ground	move something or somebody to a lower position
reduce in worth or character, usually verbally
move something or somebody to a lower position