obstruct vs obstruction

obstruct is not a noun while obstruction is a noun.

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

obstruct (noun)	obstruction (noun)
	getting in someone's way
	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

obstruct (verb)	obstruction (verb)
block passage through
shut out from view or get in the way so as to hide from sight
hinder or prevent the progress or accomplishment of