tie down vs confine

tie down and confine both are verbs.

Word	Noun	Adjective	Verb	Adverb
tie down	No	No	Yes	No
confine	No	No	Yes	No

As verbs, confine is a hypernym of tie down; that is, confine is a word with a broader meaning than tie down:

tie down: secure with or as if with ropes
confine: to close within bounds, or otherwise limit or deprive of free movement

Other hypernyms of tie down include constrain, hold, restrain.

tie down (verb)	confine (verb)
restrain from independence by an obligation	place limits on (extent or amount or access)
secure with or as if with ropes	to close within bounds, or otherwise limit or deprive of free movement
	prevent from leaving or from being removed
	deprive of freedom; take into confinement
	close in