One of the best sites to subscribe to, if you’re interested in words is Wordsmith.org
They have a service called A.Word.A.Day, which sends out a daily email containing just that.
The service comes from Anu Garg, who founded Wordsmith in 2002. Remarkably, his first language is not English, but his fascination with words led to him quitting the corporate world to spread his love of etymology.
He has a quarter of a million subscribers in 170 countries. Each week he chooses words that fit a particular theme, such as English words derived from a foreign language or words with a military connection. Feedback is encouraged, and there’s an enjoyable discussion of the week’s words delivered to your inbox at the weekend.
Each daily word email also has a pithy quote at the bottom of the page, which is a bonus.