tutor vs crammer

tutor and crammer both are nouns.

Word	Noun	Adjective	Verb	Adverb
tutor	Yes	No	Yes	No
crammer	Yes	No	No	No

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

tutor (noun)	crammer (noun)
a person who gives private instruction (as in singing, acting, etc.)	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

tutor (verb)	crammer (verb)
be a tutor to someone; give individual instruction
act as a guardian to someone