humanoid vs automaton

humanoid and automaton both are nouns.

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

As nouns, automaton is a hypernym of humanoid; that is, automaton is a word with a broader meaning than humanoid:

Other hypernyms of humanoid include golem, robot.

humanoid (noun)	automaton (noun)
an automaton that resembles a human being	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