Ursa Major vs Plough

Ursa Major and Plough both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ursa Major	Yes	No	No	No
Plough	Yes	No	No	No

Ursa Major (noun)	Plough (noun)
a constellation outside the zodiac that rotates around the North Star, also known as the Great Bear or Charles' Wain	a group of seven bright stars in the constellation Ursa Major