Not to dispute anything you said, but, some words in English are "arbitrary coinage".Avo wrote:… In English quiz or bad lack a proper etymological explanation, but so do hundreds of words and that doesn't necessarily mean they just appeared out of nowhere. ....
If this story were true (and maybe it is? but it seems doubtful), then "quiz" would be such an arbitrary coinage.
That's even more "just pop out of nowhere" than onomatopoeia, IMO.
Googling "arbitrary coinage" gives hits on, among others,
"rabulous"
"flabbergast"
"sylph"
"jillion"
"pyrex"
"idaho"
"zillion"
"zilch"
I don't know whether or not some of those are spurious, but I doubt they all are.
"zit", OTOH, is of unknown origin; that doesn't mean it doesn't have an origin, though perhaps it is an arbitrary coinage.
"zillion" and "jillion" rhyme with "million" and "billion", so they might be considered only partly arbitrary; depending on the considerer.
Googling on the etymology of "google" gives a story in which it was derived from the number-word "googol" which means 10^100 (and from which the related word "googolplex", meaning 10^(10^100), is also derived).
"Googol", OTOH, was, according to its first user (Edward Kasner), coined by Kasner's 8-or-9-year-old nephew.
See frindle for another example.
Another; "hexadecimal" was invented by IBM because they were shy about saying the at-that-time-more-correct "sexadecimal".
And there's "supercalifragilisticexpialidocious".
And so on.
If you only want to include those which have been treated as roots and/or from which other words have been back-formed, or derived, or inflected, the number may be noticeably smaller in English; but it must include "quiz" and "flabbergast" and "sylph", and possibly "google".
(It almost certainly includes no substring of "supercalifragilisticexpialidocious".)
Some words in some natlangs' real lexicons, are invented the same way words in conlangs are.