ass vs shag

ass and shag both are nouns.

Word	Noun	Adjective	Verb	Adverb
ass	Yes	No	No	No
shag	Yes	No	Yes	No

As nouns, ass and shag are synonyms defined as:

ass (noun)	shag (noun)
slang for sexual intercourse	a lively dance step consisting of hopping on each foot in turn
hardy and sure-footed animal smaller and with longer ears than the horse	slang for sexual intercourse
the fleshy part of the human body that you sit on	a fabric with long coarse nap
a pompous fool	a matted tangle of hair or fiber
	a strong coarse tobacco that has been shredded

ass (verb)	shag (verb)
	dance the shag