What part of speech is word those?

"Those" can be either a demonstrative adjective or a demonstrative pronoun, depending on its function in the sentence.

* Demonstrative adjective: When "those" modifies a noun, it acts as an adjective.

* Example: "Those apples are delicious." (modifies the noun "apples")

* Demonstrative pronoun: When "those" stands alone, representing a noun already understood, it acts as a pronoun.

* Example: "I like those." (refers to previously mentioned apples)

Therefore, the part of speech of "those" depends on its role in the sentence.