What is common? 4 photo 1 word

Look at the 4 pictures and think about what word unites them.
It's not as easy as it seems! The correct answer can be a noun, an adjective, and other parts of speech!
Click on the letters to collect the correct answer.

Feature of game:
-100 bright and colorful levels with different difficulty;
-An elaborate system of prompts and rewards;
- You can skip a level and pass it later;
- Support of Russian and English language;
-You can play with the whole family at home or on the way to work or school or university.

Enjoy the game! :)