physicist vs stargazer

physicist and stargazer both are nouns.

Word	Noun	Adjective	Verb	Adverb
physicist	Yes	No	No	No
stargazer	Yes	No	No	No

As nouns, stargazer is a hyponym of physicist; that is, stargazer is a word with a more specific, narrower meaning than physicist:

physicist (noun)	stargazer (noun)
a scientist trained in physics	heavy-bodied marine bottom-lurkers with eyes on flattened top of the head
	a physicist who studies astronomy
	someone indifferent to the busy world