automaton vs robot

automaton and robot both are nouns.

Word	Noun	Adjective	Verb	Adverb
automaton	Yes	No	No	No
robot	Yes	No	No	No

As nouns, automaton and robot are synonyms defined as:

Other synonyms of automaton include golem.

automaton (noun)	robot (noun)
a mechanism that can move automatically	a mechanism that can move automatically
a machine that operates on its own without the need for human control
someone who acts or responds in a mechanical or apathetic way