cadre vs sleeper cell

cadre and sleeper cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
cadre	Yes	No	No	No
sleeper cell	Yes	No	No	No

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

cadre: a small unit serving as part of or as the nucleus of a larger political movement
sleeper cell: a cell of sleepers

Other hyponyms of cadre include radical cell, terrorist cell.

cadre (noun)	sleeper cell (noun)
a nucleus of military personnel capable of expansion	a cell of sleepers
a small unit serving as part of or as the nucleus of a larger political movement