Brownian motion vs Brownian movement

Brownian motion and Brownian movement both are nouns.

Word	Noun	Adjective	Verb	Adverb
Brownian motion	Yes	No	No	No
Brownian movement	Yes	No	No	No

As nouns, Brownian motion and Brownian movement are synonyms defined as:

Brownian motion and Brownian movement: the random motion of small particles suspended in a gas or liquid

Other synonyms of Brownian motion include pedesis.

Brownian motion (noun)	Brownian movement (noun)
the random motion of small particles suspended in a gas or liquid	the random motion of small particles suspended in a gas or liquid