is popular and went a pronoun?

No, the Word 'popular' is an adjective, a Word used to describe a noun.

The Word 'went' is the past tense of the verb 'to go' (go, goes, going, gone, went).

A pronoun is a Word that takes the place of a noun in a sentence.

Examples:

This one is our most popular model. (adjective)

We went to the beach on our vacation. (verb)

We went to a popular restaurant on the beach. Itwas very expensive. (the pronoun 'it' takes the place of the noun 'restaurant' in the second sentence)