Languages aren't logical pre-determined constructions (unless they're intentionally designed, such as Esperanto).

Humans create languages. And they constantly change and evolve, including new words, letters, grammar, etc. Consider Old English versus Modern English [0]. Or even software companies that have become nouns or verbs in common parlance (e.g. "to google").

[0] https://en.wikipedia.org/wiki/Old_English

Have you never made up a new word or colloquialism among friends?