As a conjunction:
* It connects two words, phrases, or clauses, indicating a choice between them.
* Example: "You can have either the pizza or the pasta."
As a pronoun:
* It refers to one or the other of two things previously mentioned.
* Example: "I have two books; you can take either."
Here's a way to tell the difference:
* If "either" is followed by "or", it is a conjunction.
* If "either" stands alone, replacing a previously mentioned noun, it's a pronoun.