obstruction vs deterrent

obstruction and deterrent both are nouns.

Word	Noun	Adjective	Verb	Adverb
obstruction	Yes	No	No	No
deterrent	Yes	Yes	No	No

As nouns, deterrent is a hypernym of obstruction; that is, deterrent is a word with a broader meaning than obstruction:

obstruction: something immaterial that stands in the way and must be circumvented or surmounted
deterrent: something immaterial that interferes with or delays action or progress

Other hypernyms of obstruction include balk, baulk, check, handicap, hinderance, hindrance, impediment.

obstruction (noun)	deterrent (noun)
getting in someone's way	something immaterial that interferes with or delays action or progress
the act of obstructing
any structure that makes progress difficult
something immaterial that stands in the way and must be circumvented or surmounted
the physical condition of blocking or filling a passage with an obstruction

obstruction (adjective)	deterrent (adjective)
	tending to deter