foot soldier vs assistant

foot soldier and assistant both are nouns.

Word	Noun	Adjective	Verb	Adverb
foot soldier	Yes	No	No	No
assistant	Yes	Yes	No	No

As nouns, assistant is a hypernym of foot soldier; that is, assistant is a word with a broader meaning than foot soldier:

foot soldier: an assistant subject to the authority or control of another
assistant: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

Other hypernyms of foot soldier include help, helper, supporter.

foot soldier (noun)	assistant (noun)
fights on foot with small arms	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
an assistant subject to the authority or control of another

foot soldier (adjective)	assistant (adjective)
	of or relating to a person who is subordinate to another