toss vs stir up

toss is a noun but stir up is not a noun.

Word	Noun	Adjective	Verb	Adverb
toss	Yes	No	Yes	No
stir up	No	No	Yes	No

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

Other hypernyms of toss include agitate, commove, disturb, raise up, shake up, vex.

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

toss (verb)	stir up (verb)
agitate	provoke or stir up
throw or toss with a light motion	change the arrangement or position of
throw carelessly	arouse or excite feelings and passions
lightly throw to see which side comes up	try to stir up public opinion
move or stir about violently
throw or cast away