Inter-
Over-
Under-
Pre-
Re-
100

between or among different countries

international

100

noun for when you work later than your scheduled hours

overtime

100

to describe something which is below the surface of the earth

underground

100

noun for something which is attached to the beginning of a word to change its meaning

prefix

100

to pen something again

rewrite

200

a short break between parts of a musical or other performance

intermission

200

to respond more emotionally or over the top than is needed

overreact

200

noun for someone who hasn't completed university yet

undergraduate

200

adj to describe something that existed before history was recorded

(dinosaurs)

prehistoric

200

to pour some more liquid into a glass once it's empty

refill

300

designed to be used in way that involves participation from a user

interactive


300

having way too much faith in one's abilities or judgment

overconfident

300

adj used to describe countries without much industry (poor and third world countries)

underdeveloped

300

to see something before it is released to the general public

preview

300

when something goes away for some time then suddenly you can see it again

reappear

400

to seize, take, or stop something before it reaches its intended destination

intercept

400

verb for when a liquid runs out of something because it is to full  i.e.- a sink or a glass

overflow

400

the flow of water that moves beneath the surface.  can be dangerous in the ocean

undercurrent

400

to form an opinion about someone or a group of people before meeting them

prejudge

400

to get back at someone after something was done to you

revenge

500

to take action about something in order to affect the outcome

(usually seen when one is addicted to drugs or alcohol)

intervention

500

when the top teeth extend over the lower ones

overbite

500

a person or team with little chance to win

underdog

500

when you are in a difficult situation or a mess, and it is difficult to get out of 

predicament

500
to think about something again, especially a really tough decision

reconsider