encampment vs cantonment

encampment and cantonment both are nouns.

Word	Noun	Adjective	Verb	Adverb
encampment	Yes	No	No	No
cantonment	Yes	No	No	No

As nouns, encampment and cantonment are synonyms defined as:

encampment and cantonment: temporary living quarters specially built by the army for soldiers

Other synonyms of encampment include bivouac, camp.

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