What part of speech is eventually first?

"Eventually first" is a phrase, not a single part of speech. Let's break it down:

* Eventually is an adverb. It modifies the verb "first".

* First is an adjective (used as an adverb in this case) modifying the implied subject of the sentence.

Therefore, "eventually first" acts as a phrase that modifies the verb in a sentence, often indicating a temporal sequence (meaning it happens at a certain point in time).