obstructionist vs obstructer

obstructionist and obstructer both are nouns.

Word	Noun	Adjective	Verb	Adverb
obstructionist	Yes	No	No	No
obstructer	Yes	No	No	No

As nouns, obstructionist and obstructer are synonyms defined as:

obstructionist and obstructer: someone who systematically obstructs some action that others want to take

Other synonyms of obstructionist include obstructor, resister, thwarter.

obstructionist (noun)	obstructer (noun)
someone who systematically obstructs some action that others want to take	any structure that makes progress difficult
	someone who systematically obstructs some action that others want to take