camping site vs campground

camping site and campground both are nouns.

Word	Noun	Adjective	Verb	Adverb
camping site	Yes	No	No	No
campground	Yes	No	No	No

As nouns, camping site and campground are synonyms defined as:

camping site and campground: a site where people on holiday can pitch a tent

Other synonyms of camping site include bivouac, camping area, camping ground, campsite, encampment.

camping site (noun)	campground (noun)
a site where people on holiday can pitch a tent	a site where people on holiday can pitch a tent