* Noun: When referring to a specific time of year (e.g., "We're in the midst of summer season.")
* Verb: When referring to the act of seasoning something (e.g., "She seasoned the steak with salt and pepper.")
* Adjective: When describing something related to a specific time of year (e.g., "The seasonal flowers are blooming.")
So, to know the exact part of speech, you need to look at the context of the sentence.