Is block a pronoun

No, the Word 'block' is a noun (block, blocks) and a verb (block, blocks, blocking, blocked).

The noun 'block' is a Word for a solid object with flat sides made of wood, stone, concrete, etc.; a piece of land defined by the streets surrounding it; the length of the side of such a piece of land; a large building of offices or apartments; something that stops action or movement; something interfering with thought; a marker at the start of a race; a Word for a thing.

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

The pronoun that takes the place of the noun 'block' is it.

Example: I like living on this block because it is close to my work and shopping. (the pronoun 'it' takes the place of the noun 'block' as the subject of the second part of the sentence)