Yes, rattle is in the scrabble dictionary

...and is worth 7 points by itself if you played it.

Rattle Definition

noun

A rapid succession of short percussive sounds.
A rattling sound in the throat caused by obstructed breathing, especially near the time of death.
Loud or rapid talk; chatter.
A device that produces a rattle.
A case containing pellets used as a baby's toy.

verb-transitive

Informal To fluster; unnerve: The accident rattled me. See Synonyms at embarrass.
To cause to make a quick succession of short percussive sounds: rattled the dishes in the kitchen.
To secure ratlines to (shrouds).
To utter or perform rapidly or effortlessly: rattled off a list of complaints.

verb-intransitive

To make or emit a quick succession of short percussive sounds.
To move with such sounds: A train rattled along the track.
To talk rapidly and at length, usually without much thought: rattled on about this and that.

verb

To make a rapid succession of short sharp noises .
To chatter incessantly and aimlessly.
To move with a clatter or rattle.
To be or move about in a place or station too large or grand .
To say, perform, or affect in a brisk lively fashion .