Word formation

There are different kinds of preffixes with the different meaning and some of them are used to change the form of word or the part of speech

anti-   anti-war; anti-national; antiseptic 

counter -   counterrevolution; counterwar;  contradict

dis- dissolve; disappear; disobey; discount; disreputable; dishandle; disbalance

ex-  ex-officer; ex-girlfriend; ex-worker

en- encircle; enlarge; enact; engage; enforce

fore- forefather; foreleg; foreknow; foresee

inter-  interaction; international; intercellar; inter-city; interdependent

non-  non-alcohol; non-understanding

sub-   sibtropical; subcontinental; subway; subhead; substitute

trans-   transcontinental; transmite; transaction

post-   post-scrip; post-university; post-childhood

pre-  precaution; prefix; preposition; pre-election

over-  overcook; overpay; overdone; over; overdress; oversleep

under-  undercook; underwear; underline

ir-  irreactive; irresponsible; irreplaceble; irrrelevant

im-  impation; immortality; immediate; immovable; impossible; immature

il-  illegal, illiterate; illogical

in- inactive; inhabitat; inaccurate; inexperienced; inattentive

un-   unmistakable; unemployment; unacceptable; unbelievable