* Adjective: Describing something uncommon or not often found.
* Example: "He found a rare coin in his attic."
* Adverb: Modifying a verb, adjective, or other adverb, meaning "seldom" or "infrequently."
* Example: "She visits her family only rarely."
* Noun: Refers to something that is uncommon or unusual.
* Example: "This book contains rare first editions."
So, without context, it's difficult to say exactly what part of speech "rare" is.