Main Difference
The main difference between Adjective and Noun is that the Adjective is a part of speech that describes a noun or pronoun and Noun is a part of speech in grammar denoting a figurative or real thing or person
Adjective
In linguistics, an adjective (abbreviated adj) is a word whose main role is to modify/ describe a noun or noun phrase. Its semantic role is to change information given by the noun.
Adjectives are one of the main parts of speech of the English language, although historically they were classed together with nouns. Certain words that were traditionally considered to be adjectives, including the, this, my, etc., are today usually classed separately, as determiners.
Noun
A noun (from Latin nōmen, literally meaning “name”) is a word that functions as the name of some specific thing or set of things, such as living creatures, objects, places, actions, qualities, states of existence, or ideas. However, noun is not a semantic category, so that it cannot be characterized in terms of its meaning. Thus, actions and states of existence can also be expressed by verbs, qualities by adjectives, and places by adverbs. Linguistically, a noun is a member of a large, open part of speech whose members can occur as the main word in the subject of a clause, the object of a verb, or the object of a preposition.Lexical categories (parts of speech) are defined in terms of the ways in which their members combine with other kinds of expressions. The syntactic rules for nouns differ from language to language. In English, nouns are those words which can occur with articles and attributive adjectives and can function as the head of a noun phrase.
Adjective (noun)
A modifies a noun or describes a noun’s referent.
“The words “big” and “heavy” are English adjectives.”
Adjective (noun)
A dependent; an accessory.
Adjective (adjective)
Incapable of independent function.
“dependent|derivative”
Adjective (adjective)
Adjectival; pertaining to or functioning as an adjective.
“adjectival”
Adjective (adjective)
Applying to methods of enforcement and rules of procedure.
“procedural”
“substantive”
Adjective (adjective)
Needing the use of a mordant to be made fast to that which is being dyed.
“substantive”
Adjective (verb)
To make an adjective of; to form or convert into an adjective.
Noun (noun)
A word that can be used to refer to a person, animal, place, thing, phenomenon, substance, quality, or idea; one of the basic parts of speech in many languages, including English.
Noun (noun)
Either a word that can be used to refer to a person, animal, place, thing, phenomenon, substance, quality or idea, or a word that modifies or describes a previous word or its referent; a substantive or adjective, sometimes also including other parts of speech such as numeral or pronoun.
Noun (verb)
To convert a word to a noun.
Noun (noun)
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).