blue bull vs nilgai

blue bull and nilgai both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue bull	Yes	No	No	No
nilgai	Yes	No	No	No

As nouns, blue bull and nilgai are synonyms defined as:

blue bull and nilgai: large Indian antelope; male is blue-grey with white markings; female is brownish with no horns

Other synonyms of blue bull include Boselaphus tragocamelus, nylghai, nylghau.

blue bull (noun)	nilgai (noun)
large Indian antelope; male is blue-grey with white markings; female is brownish with no horns	large Indian antelope; male is blue-grey with white markings; female is brownish with no horns