obstructer vs obstructor

obstructer and obstructor both are nouns.

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

As nouns, obstructer and obstructor are synonyms defined as:

Other synonyms of obstructer include impediment, impedimenta, obstruction.

As nouns, obstructer and obstructor are synonyms defined as:

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

Other synonyms of obstructer include obstructionist, resister, thwarter.

obstructer (noun)	obstructor (noun)
any structure that makes progress difficult	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