president vs prexy

president and prexy both are nouns.

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

As nouns, president and prexy are synonyms defined as:

president and prexy: the head administrative officer of a college or university

president (noun)	prexy (noun)
the chief executive of a republic	the head administrative officer of a college or university
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