"Probably" is an adverb.
Probably?????????
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
Probably?????????
The word probably is an adverb. It means in all likelihood.
Probably a noun
If this word is legitimate, it is probably an adjective. A more common form is "volcanic".
The phrase "in addition" is a prepositional phrase in which "in" is the preposition and "addition" is its object. This phrase, as a phrase, is not a part of speech, although it may function as one, probably an adjective or adverb.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
By definition, "possible." As adverbs, likely and probably are synonyms, dealing with probability. By part of speech, "probably." Both likely and possible can be adjectives.
The part of speech for "explicit" is an adjective.