school vs study hall

school and study hall both are nouns.

Word	Noun	Adjective	Verb	Adverb
school	Yes	No	Yes	No
study hall	Yes	No	No	No

school (noun)	study hall (noun)
a building where young people receive education	a classroom reserved for study
the process of being formally educated at a school	a period of time during the school day that is set aside for study
an educational institution
a large group of fish
a body of creative artists or writers or thinkers linked by a similar style or by similar teachers
an educational institution's faculty and students
the period of instruction in a school; the time period when school is in session

school (verb)	study hall (verb)
swim in or form a large group of fish
educate in or as if in a school
teach or refine to be discriminative in taste or judgment