Caretaker is not well-established where I am. A caretaker takes care of grounds of schools and other similar large buildings.

I see. and that's indeed one of the two main meanings.

https://www.merriam-webster.com/dictionary/caretaker

hmmm is there some extended n-gram search these days where you can search for a specific word *with a specific meaning*?

It's not that it's bad neologism. It's that neologism is bad in general. :-)

Every word you just wrote was a neologism at some point.

New words are bad in general? How so?

Change is hard and expensive. The juice needs to be worth the squeeze.

Far too often those introducing new words (or even worse redefining existing ones) are playing power games with their in groups best interests in mind, not the rest of us.