military adviser vs consultant

military adviser and consultant both are nouns.

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

As nouns, consultant is a hypernym of military adviser; that is, consultant 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
consultant: an expert who gives advice

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

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