workout vs physical exercise

workout and physical exercise both are nouns.

Word	Noun	Adjective	Verb	Adverb
workout	Yes	No	No	No
physical exercise	Yes	No	No	No

As nouns, workout and physical exercise are synonyms defined as:

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

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

workout (noun)	physical exercise (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