reef vs take down

reef is a noun but take down is not a noun.

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

As verbs, take down is a hypernym of reef; that is, take down is a word with a broader meaning than reef:

Other hypernyms of reef include bring down, get down, let down, lower.

reef (noun)	take down (noun)
one of several strips across a sail that can be taken in or rolled up to lessen the area of the sail that is exposed to the wind
a submerged ridge of rock or coral near the surface of the water

reef (verb)	take down (verb)
roll up (a portion of a sail) in order to reduce its area	make a written note of
reduce (a sail) by taking in a reef	tear down so as to make flat with the ground
lower and bring partially inboard	reduce in worth or character, usually verbally
	move something or somebody to a lower position