toss back vs toss

toss back is not a noun while toss is a noun.

Word	Noun	Adjective	Verb	Adverb
toss back	No	No	Yes	No
toss	Yes	No	Yes	No

As verbs, toss is a hypernym of toss back; that is, toss is a word with a broader meaning than toss back:

Other hypernyms of toss back include flip, pitch, sky.

toss back (noun)	toss (noun)
	(sports) the act of throwing the ball to another member of your team
	the act of flipping a coin
	an abrupt movement

toss back (verb)	toss (verb)
throw back with a quick, light motion	agitate
	throw or toss with a light motion
	throw carelessly
	lightly throw to see which side comes up
	move or stir about violently
	throw or cast away