Previous threads:
Prize or award? - prize is something you win (possibly an object), award is more formal and will likely consist of a certificate.
reward/prize/award - based on WR dictionary, "prize" can be synonymous to "award," plus examples of usage: Nobel Prize, Academy Award.
Award vs. Prize -
"An award is usually a token of appreciation for doing something well. A prize is given if you win something by being better than others at it. A prize is usually a thing or money, while an award is often a certificate." (Tepatria)
Prize:
AE: Merriam-Webster,
Cambridge Dictionary of American English: reward, something offered in a competition/game
BE: Cambridge Advanced Learner's,
OED: something [valuable] given for succeeding in a competition or for an achievements
Dictionary.com: a reward for a victory, something won in a lottery. Synonim: premium.
Award:
M-W: something given on basis of merit/need
Cambridge Dictionary of American English,
Cambridge Advanced Learner's,
OED :
verb:to give (money or a
prize) following an official decision.
noun:
Jesse Owens award(M-W), the Academy Award(CAL), something awarded (OED)
Dictionary.com
verb:to give as due or merited; assign or bestow: to award
prizes.
noun:something awarded, as a payment or medal.
The way I see it, everybody's right. Some dictionaries emphasise one aspect, some the other. Regional differences play a part in this, too.
Nevertheless, see signature below.