oblongness vs oblong

oblongness and oblong both are nouns.

Word	Noun	Adjective	Verb	Adverb
oblongness	Yes	No	No	No
oblong	Yes	Yes	No	No

oblongness (noun)	oblong (noun)
the property of being shaped like a rectangle	a plane figure that deviates from a square or circle due to elongation

oblongness (adjective)	oblong (adjective)
	deviating from a square or circle or sphere by being elongated in one direction
	(of a leaf shape) having a somewhat elongated form with approximately parallel sides