barrier vs obstructor

barrier and obstructor both are nouns.

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

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

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

barrier (noun)	obstructor (noun)
a structure or object that impedes free movement	any structure that makes progress difficult
any condition that makes it difficult to make progress or to achieve an objective	someone who systematically obstructs some action that others want to take
anything serving to maintain separation by obstructing vision or access