After trying so many wrong ideas, I decided to figure out what bp and fp meant in the title.

The 5-letter word could be

Water, since its boiling point is 100 and its freezing point is zero. The G stands for gas and the S stands for solid.

Nice puzzle. Thank you.

After trying so many wrong ideas, I decided to figure out what bp and fp meant in the title.

The 5-letter word could be

Water, since its boiling point is 100 and its freezing point is zero. The G stands for gas and the S stands for solid. And the "ohh" in the title is a great clue that I didn't catch ( thx Amoz).

Nice puzzle. Thank you.

After trying so many wrong ideas, I decided to figure out what bp and fp meant in the title.

The 5-letter word could be

Water, since its boiling point is 100 and its freezing point is zero. I'm not sure about the G and S though.

After trying so many wrong ideas, I decided to figure out what bp and fp meant in the title.

The 5-letter word could be

Water, since its boiling point is 100 and its freezing point is zero. The G stands for gas and the S stands for solid.

Nice puzzle. Thank you.