barrier vs obstruction

barrier and obstruction both are nouns.

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

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

Other hypernyms of barrier include impediment, impedimenta, obstructer, obstructor.

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

barrier: any condition that makes it difficult to make progress or to achieve an objective
obstruction: something immaterial that stands in the way and must be circumvented or surmounted

Other hypernyms of barrier include obstacle.

barrier (noun)	obstruction (noun)
a structure or object that impedes free movement	getting in someone's way
any condition that makes it difficult to make progress or to achieve an objective	the act of obstructing
anything serving to maintain separation by obstructing vision or access	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