How do we recognize nouns in english sentencses

A noun is simply any word referring to a person, place, or thing. There are many subcategories of nouns: common, proper, countable, uncountable, concrete, abstract, compound, & collective. Though they do refer to people, places, or things, pronouns are not considered to be nouns.

Ex. Jimmy ran as fast as he could to the store though he was facing unbearable sadness that day.

Jimmy = Proper Noun store = Countable Noun sadness = Abstract Noun day = Common Noun