bear up vs brook

bear up is not a noun while brook is a noun.

Word	Noun	Adjective	Verb	Adverb
bear up	No	No	Yes	No
brook	Yes	No	Yes	No

As verbs, brook is a hypernym of bear up; that is, brook is a word with a broader meaning than bear up:

Other hypernyms of bear up include abide, bear, digest, endure, put up, stand, stick out, stomach, suffer, support, tolerate.

bear up (noun)	brook (noun)
	a natural stream of water smaller than a river (and often a tributary of a river)

bear up (verb)	brook (verb)
endure cheerfully	put up with something or somebody unpleasant