Adjutant
Part of speech: adjective
Definition: The noun used as a modifier (e.g. adjutant officer).
Part of speech: noun
Definition: A lower-ranking officer who assists a higher-ranking officer with administrative affairs. An assistant. A bird in the genus Leptoptilos of the stork family Ciconiidae.
Aide
Part of speech: noun
Definition: An assistant.An officer who acts as assistant to a more senior one; an aide-de-camp.