A part of speech -- there are eight -- defines the classification of a word.
A figure of speech is a phrase used for emphasis which is not real.
So a figure of speech is not a part of speech in the sense implied by your question.
Another answer:
'Figure of speech' is a noun phrase.
Chat with our AI personalities
The word figure is a noun and a verb (figure, figures, figuring, figured). Example uses:
As a noun: The figure I was quoted was much too high.
As a noun: You have a good figure for that style.
As a verb: I will figure out if we pay the electric bill or put gas in the car this month.
It is a figure of speech known as a synechdoche. For example, you might say "wheels" to mean a car or "bread" to represent food of all sorts.
Personifacation
It is - a figure of speech not to be taken literally
i think this is the answer for sure :noun
Metaphor