guardhouse vs HQ

guardhouse and HQ both are nouns.

Word	Noun	Adjective	Verb	Adverb
guardhouse	Yes	No	No	No
HQ	Yes	No	No	No

As nouns, HQ is a hypernym of guardhouse; that is, HQ is a word with a broader meaning than guardhouse:

guardhouse: a military facility that serves as the headquarters for military police and in which military prisoners can be detained
HQ: the military installation from which a commander performs the functions of command

Other hypernyms of guardhouse include headquarters, military headquarters.

guardhouse (noun)	HQ (noun)
a military facility that serves as the headquarters for military police and in which military prisoners can be detained	the military installation from which a commander performs the functions of command