BBC Bitesize has this introduction to nouns and proper nouns. There is a video to watch and two interactive activities.
The Children's University of Manchester has a guide to nouns and proper nouns with some interactive games. It does also cover other types of nouns that we don't learn about in Year 2.
Help your child learn how to identify common and proper nouns with these fun grammar games from Emily Guille-Marrett. Find more help with grammar on Oxford Owl: https://www.oxfordowl.co.uk/for-home/english--1/grammar-and-punctuation-at-primary-school/ What is Oxford Owl? Note that videos on YouTube may contain adverts.