school term vs academic session

school term and academic session both are nouns.

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

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

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

Other synonyms of school term include academic term, session.

school term (noun)	academic session (noun)
the time during which a school holds classes	the time during which a school holds classes