school text vs schoolbook

school text and schoolbook both are nouns.

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

As nouns, school text and schoolbook are synonyms defined as:

school text and schoolbook: a book prepared for use in schools or colleges

Other synonyms of school text include text, text edition, textbook.

school text (noun)	schoolbook (noun)
a book prepared for use in schools or colleges	a book prepared for use in schools or colleges