Definitions

Finn was born pre-programmed, all things he needed to know he was given at birth; this included his internal dictionary. He knew every word before he could speak, and what each one meant before he could walk. In many ways this had been useful, he was able to communicate with anyone who spoke the same language as him with a guarantee he knew what they were saying and could communicate his thoughts efficiently, but the longer he spent outside the First Order the more he realized how much of a hindrance it could be. The main issue goes something along the lines of as follows:

All his definitions were made by someone who had already created an idea of what each word meant in their own head, meaning what Finn got, rather than an exact definition, was often someone else’s opinion on the definition rather than the definition itself. In other words, a ton of his definitions were bias.

Or, the one in which Finn learns about words and Poe helps him stop running (in that order)