screwball vs oddball

screwball and oddball both are nouns.

Word	Noun	Adjective	Verb	Adverb
screwball	Yes	Yes	No	No
oddball	Yes	No	No	No

As nouns, oddball is a hypernym of screwball; that is, oddball is a word with a broader meaning than screwball:

Other hypernyms of screwball include eccentric, eccentric person, flake, geek.

screwball (noun)	oddball (noun)
a pitch with reverse spin that curves toward the side of the plate from which it was thrown	a person with an unusual or odd personality
a whimsically eccentric person

screwball (adjective)	oddball (adjective)
foolish; totally unsound