camping ground vs campground

camping ground and campground both are nouns.

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

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

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

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

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