blue jay vs Cyanocitta cristata

blue jay and Cyanocitta cristata both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue jay	Yes	No	No	No
Cyanocitta cristata	Yes	No	No	No

As nouns, blue jay and Cyanocitta cristata are synonyms defined as:

blue jay and Cyanocitta cristata: common jay of eastern North America; bright blue with grey breast

Other synonyms of blue jay include jaybird.

blue jay (noun)	Cyanocitta cristata (noun)
common jay of eastern North America; bright blue with grey breast	common jay of eastern North America; bright blue with grey breast