hold up vs buy time

hold up and buy time both are verbs.

Word	Noun	Adjective	Verb	Adverb
hold up	No	No	Yes	No
buy time	No	No	Yes	No

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

hold up: cause to be slowed down or delayed
buy time: act so as to delay an event or action in order to gain an advantage

Other hyponyms of hold up include stonewall, catch, stall.

hold up (verb)	buy time (verb)
cause to be slowed down or delayed	act so as to delay an event or action in order to gain an advantage
be the physical support of; carry the weight of
hold up something as an example; hold up one's achievements for admiration
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