preposition a word that shows the relationship between a noun or pronoun and other words in a sentence
adjective a word that describes or modifies a noun. In this case, 'in' can be used as part of a prepositional phrase to describe the location of something.
adverb a word that modifies or describes a verb, adjective, or another adverb. In this case, 'in' can modify a verb to show the manner in which an action is done.
preposition a word that shows the relationship between a noun (or pronoun) and other words in a sentence. In this case, 'in' shows the relationship of location or position.
preposition a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause