Nouns are peoples names, Countries/ Capital of a Country/ an object /an idea/ an action or quality.
There's common nouns and proper nouns.
Common nouns is a noun denoting a class of objects or a concept as opposed to a particular individual.
Proper nouns is a noun used for an individual person, place or organisation. Spelled with an initial capital letter. E.g. Jane, London, Oxfam.
Pronouns are he/she/ Her/him/ I/you. It/this/ Me/herself/ it/that/ they/each/ few/ many/who/ whoever/whose/ someone/everybody. It's technically a word that takes the place of a noun. So replaces a noun for a better/different word in a sentence.
Hope this helps in anyway possible.