regular and irregular noun

There seems to be some mistake in your query. There is no topic as 'Regular and Irregular Nouns' in the grammar section. However, if you wanted to know about 'Regular and Irregular Verbs', you can refer to the link given below:

https://www.meritnation.com/ask-answer/question/what-is-regular-and-irregular-verb-r-n-rn/verbs/2911881