These three words are completely different, and if said clearly, should never be confused by someone who knows their individual meanings. However, said quickly, these words can sound alike and lead to confusion – do you know the difference and take care to pronounce them carefully?

contend: [verb] taking a position or stand in an argument, competition, contest or effort
The politician contends his position again, hoping his past achievements will win back his seat. 

content: [adverb] satisfied, happy; [noun] contained or what is contained
Having finished another 10,000 words, the writer was content with her efforts.
He warily viewed the content of the student’s locker. 

contempt: [noun] feeling of disapproval and superiority to something or someone that is regarded as vile, of little account or mean
He treated all criminals with contempt, and never tried to hide the fact.