The title sounds like a question a five-year-old would ask, and most of us would reply with something like "I don't know," or "It has to be some color." But it's a valid question, and MinuteEarth has the answers, which give us an amazing glimpse into the complex chemistry of our bodies.
The main reason we don't have the answers for our kids is that the subject of bathroom functions was once not spoken of in polite society. Or even in school. But it's part of the way our bodies work, so the more we know, the better we can take control of our own health. -via Laughing Squid
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Anyway, I think trying to ascribe specific definitions to those words often misses the important points. Inductive logic never results in absolute truths, as you never test every possibility. Statements in science, like most things, just come in a giant spectrum of confidence. That confidence shifts with each new observation, prediction and competing idea, but it rarely jumps discretely from one category/label to another.
Unfortunately, having some sense of where a theory falls on the confidence spectrum usually involves learning some of its history, what observations it is based on, and what alternatives are being pursued. That takes a lot more effort than just looking at its name.
Anyway, I don't mean to be negative about the video, as it is still roughly how those words are used. But it reminds me of oversimplifications that were in primary school textbooks, which do a good job of teaching the gist of a topic, but sometimes can be counterproductive when the person stumbles over a more complex case.