resister vs obstructor

resister and obstructor both are nouns.

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

As nouns, resister and obstructor are synonyms defined as:

resister and obstructor: someone who systematically obstructs some action that others want to take

Other synonyms of resister include obstructer, obstructionist, thwarter.

resister (noun)	obstructor (noun)
someone who systematically obstructs some action that others want to take	any structure that makes progress difficult
someone who offers opposition	someone who systematically obstructs some action that others want to take