chaise vs chair

chaise and chair both are nouns.

Word	Noun	Adjective	Verb	Adverb
chaise	Yes	No	No	No
chair	Yes	No	Yes	No

As nouns, chair is a hypernym of chaise; that is, chair is a word with a broader meaning than chaise:

chaise (noun)	chair (noun)
a carriage consisting of two wheels and a calash top; drawn by a single horse	the position of professor
a long chair; for reclining	a seat for one person, with a support for the back
	an instrument of execution by electrocution; resembles an ordinary seat for one person
	a particular seat in an orchestra
	the officer who presides at the meetings of an organization

chaise (verb)	chair (verb)
	preside over
	act or preside as chair, as of an academic department in a university