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aer
aqua/hydra
arch
mono/uni
bi/du
100
Pertaining to or caused by the presence of oxygen; requiring the presence of air or free oxygen for life
What is 'aerobic'?
100
Living or found in or near water; of or relating to the animals and plants that live in or near water; done in or on water. 
What is 'aquatic'?
100
A person who promotes disorder or excites revolt against any established rule, law, or custom. 
What is an 'anarchist'?
100
Complete control over the entire supply of goods or a service in a certain market. 
What is a 'monopoly'?
100
A pair of eyeglasses having lenses with two parts with different focal lengths. 
What are 'bifocals'?
200
Having a shape that reduces drag when moving through the air.
What is 'aerodynamic'?
200
A chemical element that has no color or smell and that is the simplest, lightest, and most common element. 
What is 'hydrogen'?


200
The supreme power or sovereignty held by a single person. 
What is a 'monarchy'?
200
Describing a voice or other sound that is unchanging in pitch; without intonation or expressiveness. 
What is 'monotone'?
200
A muscle having two heads such as the large flexor muscle of the front of the upper arm.
What is a 'bicep'?
300
A gaseous or airborne cloud of particulate matter, either as a solid, liquid, or gas, which forces another substance out of a spray can. 
What is 'aerosol'?
300
To add water or moisture to something; to supply something with water. 
What is 'hydrate'?
300
Any system of persons or things ranked one above another; government by ecclesiastical rulers. 
What is a 'hierarchy'?
300
Being the only one of its kind; unlike anything else. 
What is 'unique'?
300
One of two or more identical things. 
What is a 'duplicate'?
400
A science dealing with the operation of aircraft; the art or science of flight. 
What is 'aeronautics'?
400
A glass or plastic container in which fish and other water animals and plants can live. 
What is an 'aquarium'?
400
The male head of a family or tribal line; a person regarded as the father or founder of an order, class, etc. 
What is a 'patriarchy'?
400
A belief that there is only one god. 
What is 'monotheistic'?
400
A performance by two people, especially singer, instrumentalists, or dancers. 
What is a 'duet'?
500
Living, active, occurring, or existing in the absence of free oxygen; of, relating to, or being activity in which the body incurs an oxygen debt. 
What is 'anaerobic'?
500
A discharge pipe with a valve and spout at which water may be drawn from a water main. 
What is a 'hydrant'?
500
A form of government in which all power is vested in a few persons or in a dominant class or clique; government by the few. 
What is an 'oligarchy'?
500
The condition of being tuned or sounded at the same pitch.
What is 'unison'?
500
A house divided into two apartments, with a separate entrance for each. 
What is a 'duplex'?