What is the difference between chairperson and chairman?
Chairperson is a hypernym of chairman. As nouns the difference between chairperson and chairman is that chairperson is a chairman or chairwoman, someone who presides over a meeting, board, etc while chairman is a person (implied male) presiding over a meeting.
In modern usage, terms like (chair), (moderator), (coordinator), (presiding) (officer), (group) (leader), (head), (facilitator), and so forth, are often preferred.
Historically meant a man, now also used for women.
* chair, chairperson