corps vs WAC

corps and WAC both are nouns.

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

As nouns, WAC is a hyponym of corps; that is, WAC 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
WAC: an army corps that was organized in World War II but is no longer a separate branch of the United States Army

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

corps (noun)	WAC (noun)
an army unit usually consisting of two or more divisions and their support	an army corps that was organized in World War II but is no longer a separate branch of the United States Army
a body of people associated together