I’m currently reading The Duke and I and the author is constantly using the word “acerbic”. I had never heard of the word before now and had to google the definition. The word has shown up so much that I’m tempted to go through the book and count its appearances lol.
Have you noticed any authors having favorite words that they use page after page?
Probably only noticed this one because you don’t see it every day, but “sotto voce” came up a few times in Gideon the Ninth. It’s only used maybe once or twice in the sequels and it was a bit like running into an old friend when I saw it there!