I like Next Generation that
@EbookLover suggested but I doubt that ICANN would ever change the official name for new gTLDs. It is almost always bad to use new in a name - in Canada one of our major political parties is called the New Democratic Party. They renamed to that in 1961, so the new is feeling a little old!
I agree with
@bmugford that most don't know what TLD stands for let alone ngTLD. In many ways, we can informally refer to them as we want in any case, so if we want to informally refer to them as Next Generation (whatever you want for TLD meaning) just like me can either refer to the country abbreviation or the word me.
While I tend to agree with
@garptrader that a distinction between generic and word specific makes sense, I know from once having tried to do lists, it is really hard in some cases to distinguish. Still the idea has merit since for the generic ones the match does not matter (same as .com we don't really look at match of word and .com) while for others the most important thing is the match across the dot.
Re whether an extension makes sense with order, I don't agree that it is as simple as .top do not make sense at end of phrase. That is true that for nouns the .top at end is reversed from normal order. But for example I see that GoTo.top recently sold (NB listed). For that the order is perfect. I sold a verb followed by a .top where the order made sense, and there are many other sales with sensible order, as well as sales of reversed ones. In any case I disagree with distinction on order as that would be hopeless to try to decide universally in my opinion.
Bob