animal group vs caste

animal group and caste both are nouns.

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

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

animal group: a group of animals
caste: in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony

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

animal group (noun)	caste (noun)
a group of animals	in some social insects (such as ants) a physically distinct individual or group of individuals specialized to perform certain functions in the colony
	a social class separated from others by distinctions of hereditary rank or profession or wealth
	(Hinduism) a hereditary social class among Hindus; stratified according to ritual purity
	social status or position conferred by a system based on class