circumference vs perimeter

circumference and perimeter both are nouns.

Word	Noun	Adjective	Verb	Adverb
circumference	Yes	No	No	No
perimeter	Yes	No	No	No

As nouns, circumference and perimeter are synonyms defined as:

circumference and perimeter: the size of something as given by the distance around it

circumference (noun)	perimeter (noun)
the size of something as given by the distance around it	the size of something as given by the distance around it
the length of the closed curve of a circle	the boundary line or the area immediately inside the boundary
the boundary line encompassing an area or object	a line enclosing a plane areas