Level 3
Level 2
Level 1
100

A person or thing acting or serving in place of another.

Substitute

100

A legally recognized subject or national of a state or commonwealth, either native or naturalized.

Citizen

100

Make (something) suitable for a new use or purpose; modify.


Adapt

200

Forming an unbroken whole; without interruption.

Continuous 

200

Cause (someone) to do something through reasoning or argument.

Persuade 

200

Resembling without being identical.

Similar 

300

Agreeing; accordant; congruous.

Congruent 

300

Strengthen or support (an object or substance), especially with additional material.

Reinforce 

300

Likely to have a strong or far-reaching effect; radical and extreme.

Drastic 

400

Not aware of or not concerned about what is happening around one.

Oblivious 

400

Frequency describes the number of waves that pass a fixed place in a given amount of time

Frequency 

400

A statement that the values of two mathematical expressions are equal (indicated by the sign =).

Equation 

500

Of two or more people fully in agreement.

Unanimous 

500
Not certain or fixed; provisional


Tentative 

500

Not consistent or having a fixed pattern; liable to change.

Variable