The short answer is yes, “GEO” is a valid Scrabble word. It refers to earth or soil, often used in scientific contexts like geochemistry or geography. For example, one might study the geographical impact of climate change.
Knowing that this three-letter word is playable can be strategically advantageous in Scrabble. It allows players to utilize the “G” and “O” tiles, which are sometimes difficult to place, and potentially build upon it for higher-scoring plays. While its face value might seem modest, its versatility and common usage make it a valuable addition to a player’s vocabulary. Historically, its roots lie in ancient Greek, connecting to a rich linguistic history.