circular plane vs compass plane

circular plane and compass plane both are nouns.

Word	Noun	Adjective	Verb	Adverb
circular plane	Yes	No	No	No
compass plane	Yes	No	No	No

As nouns, circular plane and compass plane are synonyms defined as:

circular plane and compass plane: a plane with a flexible face that can plane concave or convex surfaces

circular plane (noun)	compass plane (noun)
a plane with a flexible face that can plane concave or convex surfaces	a plane with a flexible face that can plane concave or convex surfaces