introduction vs textbook

introduction and textbook both are nouns.

Word	Noun	Adjective	Verb	Adverb
introduction	Yes	No	No	No
textbook	Yes	Yes	No	No

As nouns, textbook is a hypernym of introduction; that is, textbook is a word with a broader meaning than introduction:

Other hypernyms of introduction include school text, schoolbook, text, text edition.

introduction (noun)	textbook (noun)
the act of putting one thing into another	a book prepared for use in schools or colleges
the act of beginning something new
the act of starting something for the first time; introducing something new
the first section of a communication
formally making a person known to another or to the public
a basic or elementary instructional text
a new proposal

introduction (adjective)	textbook (adjective)
	according to or characteristic of a casebook or textbook; typical