In natural language, an "illusionist" is a stage magician. Not a particular category of fictional wonder-worker.An illusionist is one who uses illusions. A sorcerer or wizard is one who uses magic, both in game and out. A warlock is also one who uses magic and is beholden to an entity, both in game and out. A cleric is a religious man who prays, both in game and out. The rest are no different.
And "warlock" is, in natural language, just a synonym for magician, wizard, sorcerer, etc. This is why, in classic D&D, "warlock", "wizard" and "sorcerer" were all just level titles for magic-users.
The fact that, in 5e, they have distinct technical meanings is sufficient to show that they are jargon. They are being used in a specialisd sense that departs from (but obviously is not utterly inconsistent with or completely unrelated to) their ordinary meaning.
Huh?A fighter IS one who fights. That other classes also fight is beside the point.
If a player says of his/her PC "My guy is a fighter" and in fact the PC is a wizard but one who never gives up in a struggle, then - in natural language terms - the player has said something true, but in D&D terms the player has said something either false, or at best seriously misleading.
The term "fighter" is used as piece of jargon to distinguish a particular category of PC, not to describe a PC as one who fights.
It baffles me that you're arguing otherwise.
This is true of most jargon. "Mail" used to mean "email" describes something similar to (but not) a letter sent through the post.Class names also correspond to real world words that are similar in natural language.
"Fraud" and "knowledge" as pieces of legal jargon describes something similar to fraud and knowledge in the natural language ssenses, but not identical (eg at law someone can be said to know something "constructively", whereas in natural language what the law calls "constructive knowledge" is a species of ignorance).
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