blue bull vs Boselaphus tragocamelus

blue bull and Boselaphus tragocamelus both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue bull	Yes	No	No	No
Boselaphus tragocamelus	Yes	No	No	No

As nouns, blue bull and Boselaphus tragocamelus are synonyms defined as:

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

Other synonyms of blue bull include nilgai, nylghai, nylghau.

blue bull (noun)	Boselaphus tragocamelus (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