throw back vs toss

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

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

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

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

throw 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

throw 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