odd vs oddity

odd is not a noun while oddity is a noun.

Word	Noun	Adjective	Verb	Adverb
odd	No	Yes	No	No
oddity	Yes	No	No	No

odd (noun)	oddity (noun)
	something unusual -- perhaps worthy of collecting
	a strange attitude or habit
	eccentricity that is not easily explained

odd (adjective)	oddity (adjective)
not divisible by two
an indefinite quantity more than that specified
of the remaining member of a pair
beyond or deviating from the usual or expected
not used up
not easily explained