hold up vs bracket

hold up is not a noun while bracket is a noun.

Word	Noun	Adjective	Verb	Adverb
hold up	No	No	Yes	No
bracket	Yes	No	Yes	No

As verbs, bracket is a hyponym of hold up; that is, bracket is a word with a more specific, narrower meaning than hold up:

Other hyponyms of hold up include scaffold, block, carry, chock, buoy, buoy up, pole, underpin, prop, prop up, shore, shore up, truss, brace.

hold up (noun)	bracket (noun)
	a support projecting from a wall (as to hold a shelf)
	either of two punctuation marks ([ or ]) used to enclose textual material
	either of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual material
	a category falling within certain defined limits

hold up (verb)	bracket (verb)
cause to be slowed down or delayed	classify or group
be the physical support of; carry the weight of	place into brackets
hold up something as an example; hold up one's achievements for admiration	support with brackets
rob at gunpoint or by means of some other threat
continue to live and avoid dying
resist or withstand wear, criticism, etc.
resist or confront with resistance