workout vs exercising

workout and exercising both are nouns.

Word	Noun	Adjective	Verb	Adverb
workout	Yes	No	No	No
exercising	Yes	No	No	No

As nouns, workout and exercising are synonyms defined as:

workout and exercising: the activity of exerting your muscles in various ways to keep fit

Other synonyms of workout include exercise, physical exercise, physical exertion.

workout (noun)	exercising (noun)
the activity of exerting your muscles in various ways to keep fit	the activity of exerting your muscles in various ways to keep fit