The word supreme is an adjective. It means to have power over everything else.
Yes, supremely is an adverb. It means immensely, or to a great or extraordinary degree.
The part of speech for this particular word is a noun.
part of speech
"Supremely, very good!" in English is Supremamente veramente buono! in Italian.
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech for "breezy" is an adjective.
The part of speech for "buried" is a verb.