It is a prepositional phrase used as a conjunction.
'Additional' is an adjective. It is used to describe or modify a noun in a sentence.
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 "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
Noun
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.
It can be a preposition and an adverb. Preposition: other than; except for Adverb: In addition; also
'Additional' is an adjective. It is used to describe or modify a noun in a sentence.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The word 'amendments' is the plural form of the noun'amendment', a word for an alteration, correction, addition, or deletion to a document; a word for a thing.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.