4 Pics 1 Word Puzzles

What is the 1 word (6 letters) answer to the puzzle below? Scroll down to see the answer!

4 Pics 1 Word Answer 6 letters for rain cycle drawing for study, recycle banner with types of recycling, engine with pistons rotating and sparks, square made of four bent arrows

Cycle, Recycle, Engine, Square

The Answer is: