A noun names an object

How do we know whether the named object really is what it is being called?

Everything can be defined by boundary values

Every category

and I suspect, every proper noun as well -- a proper noun name exactly one specific thing

Sat, Mar 20, 2021

A noun (from Latin n?men, literally name)[1] is a word that functions as the name of a specific object or set of objects, such as living creatures, places, actions, qualities, states of existence, or ideas.[2][note 1] However, noun is not a semantic category, so it cannot be characterized in terms of its meaning. Thus, actions and states of existence can also be expressed by verbs, qualities by adjectives, and places by adverbs. Linguistically, a noun is a member of a large, open part of speech whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition.[3]

Lexical categories (parts of speech) are defined in terms of the ways in which their members combine with other kinds of expressions. The syntactic rules for nouns differ from language to language. In English, nouns are those words which can occur with articles and attributive adjectives and can function as the head of a noun phrase. "As far as we know, every language makes a grammatical distinction that looks like a noun verb distinction."[4]

https://en.wikipedia.org/wiki/Noun