sexual activity vs shag

sexual activity and shag both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
shag	Yes	No	Yes	No

sexual activity (noun)	shag (noun)
activities associated with sexual intercourse	a lively dance step consisting of hopping on each foot in turn
	slang for sexual intercourse
	a fabric with long coarse nap
	a matted tangle of hair or fiber
	a strong coarse tobacco that has been shredded

sexual activity (verb)	shag (verb)
	dance the shag