pound up vs constrain

pound up and constrain both are verbs.

Word	Noun	Adjective	Verb	Adverb
pound up	No	No	Yes	No
constrain	No	No	Yes	No

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

pound up: shut up or confine in any enclosure or within any bounds or limits
constrain: to close within bounds, or otherwise limit or deprive of free movement

Other hypernyms of pound up include confine, hold, restrain.

pound up (verb)	constrain (verb)
shut up or confine in any enclosure or within any bounds or limits	severely restrict in scope or extent
	to close within bounds, or otherwise limit or deprive of free movement
	compel to behave in a certain way