pole star vs Little Bear

pole star and Little Bear both are nouns.

Word	Noun	Adjective	Verb	Adverb
pole star	Yes	No	No	No
Little Bear	Yes	No	No	No

pole star (noun)	Little Bear (noun)
the brightest star in Ursa Minor; at the end of the handle of the Little Dipper; the northern axis of the earth points toward it	a constellation outside the zodiac that rotates around the North Star, also known as the Little Bear or Little Dipper