difference between a forfeit and a surrender?

PLaying a aram and the team wanted to surrender, but this guy refused because he claimed at 15 minutes it would allow us to forfeit. I fail to see the difference and when i asked the players acted as if this was my first day playing the game? How is there a difference between two words that have the same meaning basically?
Best New

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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