nucleus vs nuclear

nucleus is a noun but nuclear is not a noun.

Word	Noun	Adjective	Verb	Adverb
nucleus	Yes	No	No	No
nuclear	No	Yes	No	No

nucleus (noun)	nuclear (noun)
a part of the cell containing DNA and RNA and responsible for growth and reproduction
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
the central structure of the lens that is surrounded by the cortex
a small group of indispensable persons or things
the positively charged dense center of an atom
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

nucleus (adjective)	nuclear (adjective)
	(weapons) deriving destructive energy from the release of atomic energy
	of or relating to or constituting the nucleus of an atom
	of or relating to or constituting the nucleus of a cell
	constituting or like a nucleus