tutorial vs session

tutorial and session both are nouns.

Word	Noun	Adjective	Verb	Adverb
tutorial	Yes	Yes	No	No
session	Yes	No	No	No

As nouns, session is a hypernym of tutorial; that is, session is a word with a broader meaning than tutorial:

tutorial: a session of intensive tuition given by a tutor to an individual or to a small number of students
session: a meeting for execution of a group's functions

tutorial (noun)	session (noun)
a session of intensive tuition given by a tutor to an individual or to a small number of students	a meeting devoted to a particular activity
	a meeting for execution of a group's functions
	a meeting of spiritualists
	the time during which a school holds classes

tutorial (adjective)	session (adjective)
of or relating to tutors or tutoring