Question

A semicolon can replace what part of speech?

Answer 1

Coordinating conjunctions.

Step-by-step explanation:

It can replace coordinating conjunctions, such as: "for", "and", "nor", "but", "or", "yet", "so".
Exemplifying this: By and large, I am fond of learning the English language, but it is such a hard nut to crack sometimes.
Paraphrasing this: By and large, I am fond of learning the English language; it is such a hard nut to crack sometimes.