Is MUD a valid Scrabble word?

Yes. MUD is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What MUD means

• noun - Acronym of multi-user dungeon, an interactive online environment in which players may jointly engage in fantasy role-playing games.
• verb - To make muddy or dirty; to apply mud to (something).

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

Anagrams of MUD

• DUM

Gramlet is a daily word game played with the same Collins list. Play today's board.