absolutely new single word I mean a word that didn't exist in the language and was made up using the correct phonology of the language (I am using the qualifier "correct" because I am assuming that in today's world every language has an idea of what sounds are native and what aren't).
around pre existing words I mean coining words via contraction, compounding, portmanteau etc where words could be native or loanwords. A word like "computer" also belongs to this category.
(Note that getting a loanword doesn't belong to either category and I am not interested in that.)
I am sure many words in many languages that appear single and absolutely new could be shown to be compounds of some kind that morphed into the form at hand. However, some words were indeed absolutely new, and they had to have been. In English, a modern absolutely new word that comes to mind instantly is "grok" (I am not sure if this belongs to the second category, in which case kindly ignore this example) though this is mostly slang.
So my question is, do languages still coin absolutely new single words? If yes, are such words typically slang, or do some of them get added into formal register?
PS: Are there proper linguistic terminology that could replace the ones that I made up?
I was originally looking for absolutely new single words that weren't slang, but I've lowered my expectation and have removed that restriction.
To stress, lest people mistake, I am not focusing on English language - I used English just to give some examples.