ladder-back vs chair

ladder-back and chair both are nouns.

Word	Noun	Adjective	Verb	Adverb
ladder-back	Yes	No	No	No
chair	Yes	No	Yes	No

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

ladder-back (noun)	chair (noun)
the backrest of a chair that consists of two uprights with connecting slats	the position of professor
a chair with a ladder-back	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

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