obstructor vs resister

obstructor and resister both are nouns.

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

As nouns, obstructor and resister are synonyms defined as:

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

Other synonyms of obstructor include obstructer, obstructionist, thwarter.

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