summer camp vs day camp

summer camp and day camp both are nouns.

Word	Noun	Adjective	Verb	Adverb
summer camp	Yes	No	No	No
day camp	Yes	No	No	No

As nouns, day camp is a hyponym of summer camp; that is, day camp is a word with a more specific, narrower meaning than summer camp:

summer camp: a site where care and activities are provided for children during the summer months
day camp: a camp providing care and activities for children during the daytime

summer camp (noun)	day camp (noun)
a site where care and activities are provided for children during the summer months	a camp providing care and activities for children during the daytime