detain vs buy time

detain and buy time both are verbs.

Word	Noun	Adjective	Verb	Adverb
detain	No	No	Yes	No
buy time	No	No	Yes	No

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

detain: 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 detain include stonewall, catch, stall.

detain (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
stop or halt
deprive of freedom; take into confinement