Why Name the part of speech word in capital letters.Did you sleep at home OR cabin?

The part of speech "OR" in the sentence "Did you sleep at home OR cabin?" is a CONJUNCTION.

Let's break it down:

* Conjunctions connect words, phrases, or clauses. They show relationships between different parts of a sentence.

* OR is a coordinating conjunction. It indicates a choice between two options: Did you sleep at home *or* at the cabin?

So, while it's not conventional to capitalize parts of speech, "OR" in this sentence is a conjunction.