He jumped off the train. In the above sentence, the word "Off" is a/an:

He jumped off the train. In the above sentence, the word "Off" is a/an:

Explanation

Several words are sometimes used as adverbs or sometimes used as prepositions.

A word is a preposition when it governs a noun or a pronoun, It is an adverb when it does not.

The wheel came off. Off” is an adverb here

He jumped off the train. Off” is a preposition here