nilgai vs blue bull

nilgai and blue bull both are nouns.

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

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

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

Other synonyms of nilgai include Boselaphus tragocamelus, nylghai, nylghau.

nilgai (noun)	blue bull (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