There's no functional difference. Way back in the Dark Ages (around 2008...) people thought of blogs as being the internet form of journals. But today, almost every "website" runs on WordPress or a similar content management platform. The most notable distinction is that when people refer to a "blog," they're usually talking about a website that's run by one person (or a few people), which is focused on one (or a few) topics, and which publishes a consistent stream of new content.