Hindu deity vs avatar

Hindu deity and avatar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hindu deity	Yes	No	No	No
avatar	Yes	No	No	No

As nouns, avatar is a hyponym of Hindu deity; that is, avatar is a word with a more specific, narrower meaning than Hindu deity:

Hindu deity: a deity worshipped by the Hindus
avatar: the manifestation of a Hindu deity (especially Vishnu) in human or superhuman or animal form

Other hyponyms of Hindu deity include Aditya, Ahura, Asvins, Dharma, Garuda, Marut, Rhibhus, Ribhus, Soma, Vajra.

Hindu deity (noun)	avatar (noun)
a deity worshipped by the Hindus	the manifestation of a Hindu deity (especially Vishnu) in human or superhuman or animal form
	a new personification of a familiar idea