What is another word for muscles?

There isn't a single perfect synonym for "muscles" that works in all contexts. It depends on what aspect of muscles you're trying to capture. Here are some options with different shades of meaning:

General synonyms:

* Musculature: This refers to the entire system of muscles in a body.

* Muscles: (Yes, it's a synonym of itself, but emphasizes the plural nature)

* Fibers: This refers to the individual muscle cells.

* Flesh: This is a more general term for the soft tissues of the body, but can sometimes be used to refer to muscles.

Synonyms emphasizing function:

* Muscular system: This focuses on the muscles as a functioning system.

* Muscularity: This refers to the development and strength of muscles.

* Movers: This emphasizes the ability of muscles to move the body.

Synonyms emphasizing form:

* Bundles: This refers to the way muscle fibers are grouped together.

* Tissues: This refers to the general category of material that muscles belong to.

Informal synonyms:

* Brawn: This is a slang term for muscles, often used to describe strength.

* Biceps: This refers specifically to the muscle in the upper arm, but can be used more broadly to mean "muscles."

The best synonym for "muscles" will depend on the context of your writing or conversation.