obstruction vs obstruct

obstruction is a noun but obstruct is not a noun.

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

obstruction (noun)	obstruct (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

obstruction (verb)	obstruct (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