obstructer vs impediment

obstructer and impediment both are nouns.

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

As nouns, obstructer and impediment are synonyms defined as:

Other synonyms of obstructer include impedimenta, obstruction, obstructor.

obstructer (noun)	impediment (noun)
any structure that makes progress difficult	any structure that makes progress difficult
someone who systematically obstructs some action that others want to take	something immaterial that interferes with or delays action or progress