naturalness vs similitude

naturalness and similitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
naturalness	Yes	No	No	No
similitude	Yes	No	No	No

As nouns, similitude is a hypernym of naturalness; that is, similitude is a word with a broader meaning than naturalness:

naturalness: the likeness of a representation to the thing represented
similitude: similarity in appearance or character or nature between persons or things

Other hypernyms of naturalness include alikeness, likeness.

naturalness (noun)	similitude (noun)
the quality of being natural or based on natural principles	a duplicate copy
the likeness of a representation to the thing represented	similarity in appearance or character or nature between persons or things
the quality of innocent naivete