blue tit vs Parus caeruleus

blue tit and Parus caeruleus both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue tit	Yes	No	No	No
Parus caeruleus	Yes	No	No	No

As nouns, blue tit and Parus caeruleus are synonyms defined as:

blue tit and Parus caeruleus: widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head

Other synonyms of blue tit include tomtit.

blue tit (noun)	Parus caeruleus (noun)
widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head	widely distributed European titmouse with bright cobalt blue wings and tail and crown of the head