Thanks SHL. I think that "caretaker" (in the American meaning) was a word I looked for. I've checked the British "carer" but it seemed to be synonymous with "caregiver".
Anyway my son already returned from his conference (at least I hope so, because I'm still at work).
On this occasion we came to the conclusion that the Green Zones spoil the joy of travelling in Europe by car... but it is a topic for another thread... maybe...
I think this is one of the cases where you have to decide between the British and American word, ideally based on the audience, and stick with it, accepting that you will satisfy one group of speakers and pass the completely wrong message to the other. This thread came just a few days too late and made me realise that I should have chosen my words a bit more carefully at a social gathering where speakers from America, the UK, Ireland and non-native speakers were present. I was talking about someone who used to work as a caretaker in a school, meaning the maintenance person in the building, but it hit me after reading this that half of them probably got the wrong impression, thinking he was looking after people.
Yes, I was going to include that point that Nikola raised. You always have to consider who your audience is when selecting a particular word to use, whether the audience is more familiar with British, US/Canadian and possibly also Australian English. These differences don’t matter so much between native speakers of English, because if an American heard a British person say „carer“ in the context of someone looking after a child, the context would make the meaning clear. Likewise, if an American used a phrase like „the child’s caretaker“ a British English speaker would not be confused and think the caretaker were someone responsible for taking care of a building.
Use of the unfamiliar word might trigger an odd look, and a question like, „what’s that? I‘ve never heard that before, that’s interesting“, but would not cause a communication problem. But, a non-native English speaker could certainly experience a bit more confusion.
But, as to the word „caretaker“ in the US, since this discussion arose, I recall one rare instance where I heard the word used in the US to refer to someone looking after a building. Its use would have to be quite rare on the West Coast, but I recall an old movie, The Shining, with Jack Nicholson (1980) where Jack Nicholson and his wife and son agree to look after a luxury hotel in Colorado, and live in it, while the hotel is closed for the winter because it is inaccessible due to snow several months of the year. It’s a rather bizarre thriller kind of movie, but the point is, Jack Nicholson takes on the job of the hotel‘s „caretaker“ during the snowed in winter season, according to people in the movie describing his duties.
That one old movie is the only example that comes to mind of someone using the word „caretaker“ to refer to someone looking after a building in the US, so I cannot say the use of the word in that context is totally unheard of. Only unusual.