primer vs school text

primer and school text both are nouns.

Word	Noun	Adjective	Verb	Adverb
primer	Yes	No	No	No
school text	Yes	No	No	No

As nouns, school text is a hypernym of primer; that is, school text is a word with a broader meaning than primer:

Other hypernyms of primer include schoolbook, text, text edition, textbook.

primer (noun)	school text (noun)
any igniter that is used to initiate the burning of a propellant	a book prepared for use in schools or colleges
the first or preliminary coat of paint or size applied to a surface
an introductory textbook