obstruction vs closure

obstruction and closure both are nouns.

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

As nouns, closure is a hyponym of obstruction; that is, closure is a word with a more specific, narrower meaning than obstruction:

Other hyponyms of obstruction include blockage, occlusion, stall, stalling, obstruction of justice.

As nouns, closure is a hyponym of obstruction; that is, closure is a word with a more specific, narrower meaning than obstruction:

obstruction (noun)	closure (noun)
getting in someone's way	termination of operations
the act of obstructing	the act of blocking
any structure that makes progress difficult	approaching a particular destination; a coming closer; a narrowing of a gap
something immaterial that stands in the way and must be circumvented or surmounted	an obstruction in a pipe or tube
the physical condition of blocking or filling a passage with an obstruction	a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric
	something settled or resolved; the outcome of decision making
	a rule for limiting or ending debate in a deliberative body

obstruction (verb)	closure (verb)
	terminate debate by calling for a vote