Adwords is an advertising platform and absence is when you go missing....not sure about the relevance of the question.
They're essentially the same thing from 2 different perspectives. Adwords is where you pay to have your ads displayed on other sites Adsense is where you get paid to display those ads.
According to surpport.google.com The Google AdWords program enables you to create advertisements which will appear on relevant Google search results pages and our network of partner sites While The Google AdSense program differs in that it delivers Google AdWords ads to individuals' websites. Google then pays web publishers for the ads displayed on their site based on user clicks on ads or on ad impressions, depending on the type of ad. Tecmobs Team