I think axiom should fit, but according to its official definition, an axiom is a statement that is taken to be true, and as far as I know, a word can’t make an statement by its own.
I think axiom should fit, but according to its official definition, an axiom is a statement that is taken to be true, and as far as I know, a word can’t make an statement by its own.
I agree. But thinking in a mathematical way, they talk about defining things in terms of simpler things.
So we could change the question to be “What do you call a word that can’t be defined in terms of simpler words?”
For example. In English, try to define “a”