What part of speech is the word unlike?

"Unlike" can be two different parts of speech, depending on how it's used:

1. Preposition: When used to introduce a phrase that contrasts something with something else, it's a preposition.

* Example: "Unlike my brother, I love spicy food."

2. Adjective: When used to describe something as being different from something else, it's an adjective.

* Example: "The two houses were unlike in style."

So, to determine the part of speech, look at how it's used in the sentence.