* Noun: "The context of the conversation was important to understand the meaning." (Here, context is the subject of the sentence)
* Adjective: "The contextual clues helped solve the mystery." (Here, contextual modifies the noun "clues")
* Adverb: "The meaning of the word is contextually dependent." (Here, contextually modifies the adjective "dependent")
So, the part of speech of "context" depends on its function in the sentence.