different between frontiersman vs frontierman

English

From frontiers +? man.

frontiersman (plural frontiersmen)

A person who lives on the borders of a country, or in a wild and undeveloped area on the fringes of civilization.
- 2002, Colin Jones, The Great Nation, Penguin 2003, p. 136-7:
  The inhabitant's of England's North American colonies outnumbered French Canadians some ten to one, but the French were tough, fur-trapping frontiersmen who posed a considerable military threat.

frontier +? -man

frontierman (plural frontiermen)

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