It was a disc and the trees were able to be interacted with face to face so I think those are inexplicable except for “they’re magic”.
There’s a wikipedia article with some depictions actually right here: https://en.wikipedia.org/wiki/Two_Trees_of_Valinor#Creation
If you’re not part of the group, then don’t use it. I’d say maybe the only exception is “queer”. I’m fine with people using queer to describe their friends and family who are queer. Not everyone is OK with it though, but it’s pretty common. With queer, don’t use it unless the person you’re talking to self identifies as queer.