corps vs ROTC

corps and ROTC both are nouns.

Word	Noun	Adjective	Verb	Adverb
corps	Yes	No	No	No
ROTC	Yes	No	No	No

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

corps: an army unit usually consisting of two or more divisions and their support
ROTC: a training program to prepare college students to be commissioned officers

Other hyponyms of corps include WAC, Women's Army Corps, Reserve Officers Training Corps.

corps (noun)	ROTC (noun)
an army unit usually consisting of two or more divisions and their support	a training program to prepare college students to be commissioned officers
a body of people associated together