Anu Garg is a computer scientist, a public speaker, an author and the creator of wordsmith.org, home of the "A Word A Day Newsletter", running for over 18 years and with over one million subscribers. (AWAD is free, by the way!)
He introduces five new words a week, grouped by a common theme, providing definitions, sample usage and famous quotations, followed by a weekend roundup of replies to his messages of the past week. There's even a link to an audio file of his wife pronouncing the word!
If you aren't yet a subscriber, this might be an excellent week to join. This week's theme is words derived from card games. The first word, released today, is
euchre, which also happened to appear in another week's theme,
words derived from poker.