president vs chairperson

president and chairperson both are nouns.

Word	Noun	Adjective	Verb	Adverb
president	Yes	No	No	No
chairperson	Yes	No	No	No

As nouns, president and chairperson are synonyms defined as:

president and chairperson: the officer who presides at the meetings of an organization

Other synonyms of president include chair.

president (noun)	chairperson (noun)
the chief executive of a republic	the officer who presides at the meetings of an organization
an executive officer of a firm or corporation
the head administrative officer of a college or university
the officer who presides at the meetings of an organization