Prefixes
Water
Energy
Suffixes
Idioms
100

When someone isn't given enough money for the job they're doing.

What is being underpaid?

100

A structure used to block off water or control its flow.

What is a dam?

100

When the temperature of water goes to 0 degrees Celsius. 

What is freezing?

100

Synonym for "ailment" or "illness"

What is a sickness?

100

When you get really angry.

What is "seeing red"?

200

Something in the air above you.

What is overhead?

200

The taste of the sea.

What is salty?

200

When water dries up due to the heat of the sun.

What is evaporation?

200

To have a lot of imagination, especially artistically.

What is creativity?

200

You can buy things illegally here.

What is a black market?

300

Someone who accomplishes more than what is expected or normal.

What is an overachiever?

300

The supply of water to land or crops to help growth.

What is irrigation?

300

Renewable energy generated by flowing water.

What is hydroelectricity?

300

The distance between opposite sides of something, the quality of something's girth.

What is thickness?

300

When things aren't completely one way or another.

What is a gray area?

400

Something that is made to do too much.

What is being overworked?
400

A slowly moving mass or river of ice formed near and in the Poles.

What is a glacier?

400

A natural or artificial lake meant for keeping water.

What is a reservoir?

400

Synonym for likelihood, availability of a choice.

What is a possibility?

400

When you are jealous.

What is "green with envy"?

500

Something that is overused.

What is being exploited?

500

A shortage of water due to lack of rainfall.

What is a drought?

500

The amount of water used by an activity.

What is a water footprint?

500

Synonym for physical power.

What is strength?

500

When something causes you extreme excitement, tension, or fear.

What is a white-knuckle ride?