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.
A prepositional phrase.
On the mountain top is a preposition phrase, not a part of speech.
A prepositional phrase.
The phrase "will practice" is a verb (future tense).
They could be used as several different parts of speech. Typically the entire phrase acts as one part of speech... a noun phrase, a verb phrase, etc.
"In addition" is considered an adverbial phrase that is used to introduce new information or to add to what has already been said.
A phrase is never a part of speech, only a word.
Prepositional phrase
"Of the field" is a prepositional phrase. The word "of" is a preposition, and "the field" is the object of the preposition.
A prepositional phrase.
On the mountain top is a preposition phrase, not a part of speech.
That I am is a phrase, the individual words in the phrase are parts of speech. That -- demonstrative, determiner I -- pronoun am -- be verb
"That" is a pronoun, while "I" is a pronoun and "am" is a verb.
A phrase is a group of words that functions as a unit in a sentence but does not contain a subject and a verb. It can act as a noun, adjective, or adverb within a sentence.
adverb phrase
verb
A prepositional phrase.