encampment vs camping ground

encampment and camping ground both are nouns.

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

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

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

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

encampment (noun)	camping ground (noun)
the act of encamping and living in tents in a camp	a site where people on holiday can pitch a tent
temporary living quarters specially built by the army for soldiers
a site where people on holiday can pitch a tent