There are more types of text that you can add to your scenes. Basically, they help you to add multiple pieces of text in a scene that can appear at the same time in different positions and styles. Much like seeing a heading that stays always while other captions and labels play alongside.
You could choose to make them a bumper. Bumpers stay on the screen for the entire duration of the scene. Currently,they must be set to captions.
LOWER THIRD is similar to a piece of text on the scene irrespective of the other text types such as caption or bumper.
It is to be kept in mind that Lower THird shouldn't be put as the last piece of text, it should be either in the start or the middle.
CAPTION- "This dramatic coastline offers a majestic glimpse into the ferocious power of nature."
LOWER THIRD- "AMAZING"
Here is a video for the distinction: