calisthenics vs plural form

calisthenics and plural form both are nouns.

Word	Noun	Adjective	Verb	Adverb
calisthenics	Yes	No	No	No
plural form	Yes	No	No	No

calisthenics (noun)	plural form (noun)
the practice of calisthenic exercises	the form of a word that is used to denote more than one
light exercises designed to promote general fitness