Word Challenge Day 3

Welcome to another word guess.

The participants have to guess the word and post their guessed word in the form given in the link below. Remember to enter your hive/ecency username as well.

https://word.scriptground.com/?n=3

Then come back to this post and in the comments just write "Participated". Only one entry per user is allowed. Do not write the guessed word in the comments.

Today's word is an easy one to guess:

Hint 1: It is essential for all living things.
Hint 2: The formula contains two H in it.
Hint 3: It is the most abundant component on the earth's surface.

I will announce the winner tomorrow insha Allah. The winner gets a full upvote. When there are multiple right answers, the winner is selected by random draw.

Congrats @tahirazaman for winning yesterday's challenge.