The Powhatans harsh treatment of the bodies of their victims was symbolic of their contempt for their opponents. The Indians also burned most of the outlying plantations, destroying the livestock and crops. The colonists in Jamestown were in an uproar, stunned by the massacre.
He meant it as master or perfect race.
A thesaurus does not discriminate words of certain origin (so foreign or non-foreign) and neither does it specialist in some parts of speech (so not in adjectives).
the correct answer is synonyms: it is a dictionary that groups synonyms together.