4 photo 1 common word

Can you guess all the levels without opening additional photos?
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.