Answer:
Synonyms are words that are similar to another word or have a related meaning.
An antonym, is a word with a meaning that is opposite to the meaning of another word.
Explanation:
The hyperbole 'ice-hard' has the effect of increasing how good Orpheus's music sounded, because it portrays Hades as being cold and unmoving, yet still Orpheus was able to break through that to make Hades feel emotion