Start with high-confidence spelling & vocabulary books, then narrow by subgenre or adjacent topics.
The Highly Selective Dictionary for the Extraordinarily Literate
Eugene Ehrlich
Tooth and Nail
Joseph Elliot
Divided by a Common Language
Christopher Davies
Merriam-webster’s Everyday Language Reference Set
Merriam-Webster
The Well-spoken Thesaurus
Tom Heehler
The Vocabulary Builder Workbook
Chris Lele, Magoosh
