I've even been able to invent new words where none existed before by joining certain words.

From what I found out, he says that there's now a need for answers to social issues and not invented words.

No one would say that those were not invented words.

The latest crop includes vegetables, colors and invented words of all sorts.

You think, I dare say, that our chief job is inventing new words.

It seems, that (American-) English only changes if its native speakers invent new words.

Many people invent such words; this one seems simply to have been lucky enough to have spread a little.

He says he's having to invent words because there aren't any for the things he's doing.

In the old days, of course, when English was a new language, writers could invent new words and use them.

And there's always the option of reshaping or simply inventing words.