elliptic vs oval

elliptic is not a noun while oval is a noun.

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

As adjectives, elliptic and oval are synonyms defined as:

Other synonyms of elliptic include egg-shaped, elliptical, oval-shaped, ovate, oviform, ovoid, prolate.

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

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