Select the option that can be used as a one-word substitute for the given group of words.

A large group of people, especially the nomadic

Horde

The term "horde" refers to a large group of people, often nomadic in nature. It can describe a crowd, multitude, or mass of individuals gathered together. In the given group of words, "a large group of people, especially the nomadic," the word "horde" accurately captures the concept of a sizable assembly, particularly emphasizing the nomadic aspect.

"Cavalry" refers to a military unit that fights on horseback. While it involves a group of people, it specifically pertains to soldiers mounted on horses and engaged in combat.

"Urban" relates to characteristics associated with cities or urban areas. It doesn't specifically indicate a large group of people, especially the nomadic.

"Hamlet" refers to a small village or settlement, typically smaller than a town. It is the opposite of a large group of people and doesn't capture the nomadic aspect mentioned in the given group of words.

Therefore, "Horde" is the most appropriate one-word substitute for the given group of words as it represents a significant, often nomadic, gathering of people.