nucleus vs cadre

nucleus and cadre both are nouns.

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

As nouns, cadre is a hyponym of nucleus; that is, cadre is a word with a more specific, narrower meaning than nucleus:

nucleus (noun)	cadre (noun)
a part of the cell containing DNA and RNA and responsible for growth and reproduction	a nucleus of military personnel capable of expansion
any histologically identifiable mass of neural cell bodies in the brain or spinal cord	a small unit serving as part of or as the nucleus of a larger political movement
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