military adviser vs adviser

military adviser and adviser both are nouns.

Word	Noun	Adjective	Verb	Adverb
military adviser	Yes	No	No	No
adviser	Yes	No	No	No

As nouns, adviser is a hypernym of military adviser; that is, adviser is a word with a broader meaning than military adviser:

military adviser: a military officer who serves as an adviser to the troops of an allied nation
adviser: an expert who gives advice

Other hypernyms of military adviser include advisor, consultant, military officer, officer.

military adviser (noun)	adviser (noun)
a military officer who serves as an adviser to the troops of an allied nation	an expert who gives advice