oval vs oval-shaped

oval is a noun but oval-shaped is not a noun.

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

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

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

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

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