Once upon a time in a business meeting I was asked, which is better Dreamweaver vs WordPress. I didn't think I would ever be asked such an odd question. I told her that it was like comparing apples and oranges and here's why.
Dreamweaver is a tool that helps web designers, and web developers create websites. WordPress is a tool for managing web pages. WordPress is also a website, granted a very complex website, but it's still just a website. You use Dreamweaver to make websites like WordPress or any other CMS.
A WordPress or CMS is just a website application that allows website owners and website colaborators to manage the website easier. CMS technology also allows a website owner to manage/edit his website without needing to know markup or programming languages.
WordPress is one of the most popular CMS technologies currently available. WordPress is open source, so it's free and editable. WordPress makes use themes, which allow the website owner to change the appearance and structure of the site. Widgets are also a key feature of a WordPress website and allows the website owner to drag and drop appearance and functionality of the website. Plugins are also an important part of WordPress, allowing users to dramatically increase the ability of the base install.