Are you smart enough to beat this quiz?

Sorry, but the quiz is just not good. There are way too many possible answers for most pictures. The fact that there is no common theme among them, makes guessing even more complicated.

For world: planet, globe, Earth, (South) America, space, water.

For Youtube: (smart)phone, iPhone, message (because of "good to know" on the top of the screen) and if we follow your logic: Facebook, Wordpress, WhatsApp...

For feelings: smiling, happiness, smileys.

For chicks: chickens, ducklings, birds.

For food (seriously?!): berry / berries, raspberries, blueberries, blackberries.

For sleeping: baby, sleep.

And barnacle is simply wrong. That's a swan.

If someone gets right 2 or 12 doesn't have much to do with their intelligence. It only matters if they manage to figure out exactly the word you had in mind. And that's not the idea of the quizzes in general.