Honorifics are more of an “open class”… https://en.wikipedia.org/wiki/Part_of_speech#Open_and_closed_classes https://en.wikipedia.org/wiki/Part_of_speech#Open_

Honorifics are more of an “open class”… https://en.wikipedia.org/wiki/Part_of_speech#Open_and_closed_classes https://en.wikipedia.org/wiki/Part_of_speech#Open_and_closed... This really just a way of rephrasing what the parent comment says. By some reckonings, in English, pronouns are a closed class, and verbs are an open class. Some languages have it the other way around, where you can invent new pronouns but not new verbs (you have to take a noun X and say “do X” or something like that).