frontiersman vs pioneer

frontiersman and pioneer both are nouns.

Word	Noun	Adjective	Verb	Adverb
frontiersman	Yes	No	No	No
pioneer	Yes	No	Yes	No

As nouns, pioneer is a hypernym of frontiersman; that is, pioneer is a word with a broader meaning than frontiersman:

Other hypernyms of frontiersman include adult male, man.

frontiersman (noun)	pioneer (noun)
a man who lives on the frontier	one of the first colonists or settlers in a new territory
	someone who helps to open up a new line of research or technology or art

frontiersman (verb)	pioneer (verb)
	open up and explore a new area
	open up an area or prepare a way
	take the lead or initiative in; participate in the development of