Career - Talking with me like this can't be doing your career any good.
               She had a short career as an actor.
Carrier-The carrier gave me a copy of that document.
             The only clean and perfectly dressed carrier was Mr.James.
Whit- The last whit of warmth drawn off by the setting sun.
          I did not give a whit to what he said.
Wit- Austen had a quick wit and a gentle personality.
       The writer's poems,novels,stories are full of wit and cheerful energy.
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Career: Choosing a career in the field of Political Science is not very easy.
Carrier: Mosquitoes are carriers of several viruses. 
Whit: She is not whit bit afraid of cockroaches.
Wit: Ramesh is a man of wit.
Hope I helped :)