a word (other than a pronoun) used to identify any of a class of people, places, or things common noun, or to name a particular one of these proper noun. a word that can function by itself as a noun phrase and that refers either to the participants in the discourse (e.g., Iyou ) or to someone or something mentioned elsewhere in the discourse (e.g., sheitthis )
A compound word is a combination of two or more words that function as a single unit of meaning. There are three types of compounds: Those written as single words, with no hyphenation, are called closedcompounds--the word "flowerpot," for example
Noun is a word that names a person, a place, a thing, a quality or  an idea.