animal group vs school

animal group and school both are nouns.

Word	Noun	Adjective	Verb	Adverb
animal group	Yes	No	No	No
school	Yes	No	Yes	No

As nouns, school is a hyponym of animal group; that is, school is a word with a more specific, narrower meaning than animal group:

Other hyponyms of animal group include team, brood, flock, flock, fold, herd, herd, pack, pod, pride, clowder, shoal, caste, colony, warren, breed, stock, strain, drove, litter.

animal group (noun)	school (noun)
a group of animals	a building where young people receive education
	the process of being formally educated at a school
	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

animal group (verb)	school (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