The above great video by It’s Okay To Be Smart explains words such as theory, hypothesis, fact and law in the way that scientists use them, not the way we use them in everyday speech.
As the article at Sciencedump, You might think you know, but do you really? Important scientific words explained!, says:
“I don’t know about you, but I’m getting kind of sick of people misunderstanding the words theory and hypothesis and turning them into something bad. Whenever I hear someone say that evolution is only a theory, I am immediately reminded of Wallace Shawn’s character Vizzini from The Princess Bride going around yelling “inconceivable!” at every turn, and in really having no clue what it actually means.”