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Is mastery a Scrabble word?
Word Games
- Scrabble US/Canada (OTCWL) Yes
- Scrabble UK (SOWPODS) Yes
- Wordle No
- Words With Friends Yes
Scrabble US/Canada (OTCWL) 
Wordle 
Words With Friends What is the meaning of mastery?
Definition
noun (English)
1. (obsolete) A contest for superiority.Examples: "[…] pastimes of wrestling, and like maſteries betweene the Citizens of London and others of the Suburbes […]"; "Rury has given the word for some rare sport — a bout of games and masteries between me and Marcos Serkman to prove which is the better man."; "Come, Paolo, we two have never held / A mastery between us — tell me out!"obsoleteuncountableusually
2. (obsolete) A masterly operation; a feat.Examples: "Ye welsh men..brake out vpon the Englysshe men in ye Bordour..and there made masteryes for a whyle."; "That ye maye knowe..what masteryes they haue played."; "By a number of odde speeches..you doo yet suppose to haue wrought a mastery."obsoleteuncountableusually
3. (obsolete) The philosopher's stone.obsoleteuncountableusually
Definition source: Wiktionary