from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix Persons who are experts in an area; e.g. horsemen, sportsmen.
- suffix Persons who are employed or hold a position in an area; e.g lawmen, newsmen.
- suffix Persons who have special characteristics relating to an area, e.g. freemen, icemen, supermen.
- suffix In certain cases, persons who derives from a particular nationality; e.g. Scotsmen, Chinamen.
From men, plural of man. (Wiktionary)