school text vs crammer

school text and crammer both are nouns.

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

As nouns, crammer is a hyponym of school text; that is, crammer is a word with a more specific, narrower meaning than school text:

Other hyponyms of school text include introduction, primer, reader.

school text (noun)	crammer (noun)
a book prepared for use in schools or colleges	a textbook designed for cramming
	a special school where students are crammed
	a student who crams
	a teacher who is paid to cram students for examinations