ellipse vs elliptic

ellipse is a noun but elliptic is not a noun.

Word	Noun	Adjective	Verb	Adverb
ellipse	Yes	No	No	No
elliptic	No	Yes	No	No

ellipse (noun)	elliptic (noun)
a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it

ellipse (adjective)	elliptic (adjective)
	characterized by extreme economy of expression or omission of superfluous elements
	rounded like an egg
	(of a leaf shape) in the form of an ellipse