session vs academic session

session and academic session both are nouns.

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

As nouns, session and academic session are synonyms defined as:

session and academic session: the time during which a school holds classes

Other synonyms of session include academic term, school term.

session (noun)	academic session (noun)
a meeting devoted to a particular activity	the time during which a school holds classes
a meeting for execution of a group's functions
a meeting of spiritualists
the time during which a school holds classes