GHQ vs general headquarters

GHQ and general headquarters both are nouns.

Word	Noun	Adjective	Verb	Adverb
GHQ	Yes	No	No	No
general headquarters	Yes	No	No	No

As nouns, GHQ and general headquarters are synonyms defined as:

GHQ and general headquarters: military headquarters from which a military commander controls and organizes the forces

Other synonyms of GHQ include command post.

GHQ (noun)	general headquarters (noun)
military headquarters from which a military commander controls and organizes the forces	military headquarters from which a military commander controls and organizes the forces