* Noun: This is the most common usage. It refers to a group of things gathered together.
* Example: "He has a large collection of stamps."
* Verb: It can also be used as a verb meaning "to gather or assemble" something.
* Example: "The museum is collecting artifacts from ancient civilizations."
* Adjective: It can act as an adjective meaning "relating to or characterized by collecting."
* Example: "She has a collection habit."
To determine the part of speech, consider how the word is used within the sentence and its relationship to other words.