obstacle vs obstructor

obstacle and obstructor both are nouns.

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

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

obstacle: an obstruction that stands in the way (and must be removed or surmounted or circumvented)
obstructor: any structure that makes progress difficult

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

obstacle (noun)	obstructor (noun)
an obstruction that stands in the way (and must be removed or surmounted or circumvented)	any structure that makes progress difficult
something immaterial that stands in the way and must be circumvented or surmounted	someone who systematically obstructs some action that others want to take