over-
under-
pre-
re-
sub-
100

noun for when you work later than your scheduled hours

overtime

100

adjective to describe something which is below the surface of the earth (also a noun)

underground

100

adjective used to describe something that existed before history was recorded

prehistoric

100

to write something again

rewrite

100

translated words under a screen in foreign language films

subtitles

200

adjective who is heavier than they should be

overweight

200

noun for someone who has not completed university

undergraduate 

200

part of speech, a word class used to define position or direction

preposition

200

to pour some more liquid to the top of a something after it has been emptied, e.g. soap or a fizzy drink

refill

200

not the main story in a film or play, but a lesser one that also happens

subplot

300

adjective to describe somewhere where there are too many people

overcrowded

300

adjective used to describe agricultural countries without much industry

underdeveloped

300
to see something, e.g. a film, before it is released for the general public

preview

300

when something goes away or you can't see it and then you can 

reappear

300

adjective to describe a person who is more like an animal than a person (a human being)

subhuman

400
adjective to describe something that has been boiling or in the oven too long, e.g. vegetables

overcooked

400

verb for when someone asks you to pay less than you should for something

undercharge

400

to form an opinion about a person before you really know them, esp. based on ethnicity or gender

prejudge

400

to rebuild something

reconstruct

400

adjective to describe something that is below the usual acceptable level

sub-standard

500

verb for guessing the price something will be or the time it will take and you guess too much

overestimate

500

verb for guessing the price something will be or the time it will take and you guess too little

underestimate

500

actions taken to improve safety, i.e. to reduce the risk related to a certain situation

precautions

500

to think about something again, esp. a decision

reconsider

500

a warship with a streamlined hull designed to operate completely submerged in the sea for long periods

submarine

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