Ursa Major vs Great Bear

Ursa Major and Great Bear both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ursa Major	Yes	No	No	No
Great Bear	Yes	No	No	No

As nouns, Ursa Major and Great Bear are synonyms defined as:

Ursa Major and Great Bear: a constellation outside the zodiac that rotates around the North Star, also known as the Great Bear or Charles' Wain

Ursa Major (noun)	Great Bear (noun)
a constellation outside the zodiac that rotates around the North Star, also known as the Great Bear or Charles' Wain	a constellation outside the zodiac that rotates around the North Star, also known as the Great Bear or Charles' Wain