What is a content writer?
A content writer delivers high-quality, relevant, and engaging content, like blog posts, articles, and how-to guides. Their purpose is to inform readers so they begin to view the business as an industry leader.
What is a copywriter?
A copywriter provides businesses with sales copy with the intent of persuading the target audience to do something. This type of content marketing strategy is more about advertising, building brand awareness, and influencing the reader to take a certain action.
Source & details: Content Writer vs. Copywriter: Definitions & Key Differences – Upwork.