Apex  

Noun | ey-peks
the highest point of something

Decree  

Verb | dih-kree
to declare formally and with authority

Cultivate  

Verb | kuhl-tuh-veyt
to prepare and use land for growing plants for food or to sell

Culmination  

Noun | kuhl-muh-ney-shuhn
the final act or climax

Counterproductive  

Adjective | koun-ter-pruh-duhk-tiv
hindering the achievement of a goal

Counterargument  

Noun | koun-ter-ahr-gyuh-muhnt
an argument used to criticize or dismantle another argument

Counteract  

Verb | koun-ter-akt
to work in opposition to

Corroborate  

Verb | kuh-rob-uh-reyt
to provide evidence for; to back up (a claim)