This is any symbols of an alphabet.

This is the intended interconnectedness of sentences to convey meaning.

This is a small group of any words.

Clause can be considered as sentence.

In a dark and dangerous hallway.

Boy whose mom has red hair.

Then sped down the street on fire!

She couldn't believe the dog actually ate it.

This refers to a unit larger than a sentence.

A phrase

A clause

This is made up of signs and symbols systematized by grammar and organized logical language to properly present the intended message.

Jumping up and down on the bed.