* Noun: It can be a plural noun referring to people or things that keep something, like "The keepers of the ancient secrets."
* Adjective: It can be an adjective meaning "worthy of being kept" or "of high quality," like "These are keepers! I'm going to buy all of them."
* Verb: It can be a verb in the present tense, meaning "to keep," like "She keepers her promises." This usage is less common and often considered informal.
To determine the correct part of speech, you need to look at the sentence it's used in and understand the context.