crammer vs private instructor

crammer and private instructor both are nouns.

Word	Noun	Adjective	Verb	Adverb
crammer	Yes	No	No	No
private instructor	Yes	No	No	No

As nouns, private instructor is a hypernym of crammer; that is, private instructor is a word with a broader meaning than crammer:

crammer: a teacher who is paid to cram students for examinations
private instructor: a person who gives private instruction (as in singing, acting, etc.)

Other hypernyms of crammer include coach, tutor.

crammer (noun)	private instructor (noun)
a textbook designed for cramming	a person who gives private instruction (as in singing, acting, etc.)
a special school where students are crammed
a student who crams
a teacher who is paid to cram students for examinations