daydreamer vs stargazer

daydreamer and stargazer both are nouns.

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

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

Other hyponyms of daydreamer include lotus-eater, dreamer, escapist, wishful thinker.

daydreamer (noun)	stargazer (noun)
someone who indulges in idle or absentminded daydreaming	heavy-bodied marine bottom-lurkers with eyes on flattened top of the head
	a physicist who studies astronomy
	someone indifferent to the busy world