The option that can be used as a one-word substitute for the given group of words "The property left to someone by a will" is "Legacy."

Explanation of the options:

☀ Ledger: This word refers to a book or other record in which financial accounts are kept.

☀ Legacy: This word refers to property, money, or other assets that are left to someone in a will.

☀ Legend: This word can have multiple meanings, such as a traditional story or myth, a key to interpreting a map or chart, or a famous or important person.

☀ Lexical: This word refers to anything related to words or the vocabulary of a language.