oviform vs oval

oviform is not a noun while oval is a noun.

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

As adjectives, oviform and oval are synonyms defined as:

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

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

oviform (adjective)	oval (adjective)
rounded like an egg	rounded like an egg