Final answer:
The game that started as "Lexico" in 1931 and involves using lettered tiles to build words is Scrabble.
Step-by-step explanation:
The game that began as "Lexico" in 1931 and involves building words from lettered tiles is known as Scrabble. This popular word game was created by Alfred Mosher Butts, an American architect, and has since become a beloved pastime for many. Over the years, Scrabble has evolved and spawned various editions, but the classic game remains a staple in households and has even become a competitive sport with official tournaments.