egg-shaped vs oval

egg-shaped is not a noun while oval is a noun.

Word	Noun	Adjective	Verb	Adverb
egg-shaped	No	Yes	No	No
oval	Yes	Yes	No	No

As adjectives, egg-shaped and oval are synonyms defined as:

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

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

egg-shaped (adjective)	oval (adjective)
rounded like an egg	rounded like an egg