What is the difference between an adjective vs pronoun?

Hint: An adjective is a word that is related to a noun in order to modify or classify it.
A pronoun is a term that functions as a substitute for a noun.

Complete answer:
Pronouns are words that function as a substitute for a noun. For instance, I, He, She, It, They, and so on.
Example: Ram is a healthy and knowledgeable young man.
Substitute a pronoun for the noun in this sentence.
Ram is a healthy and knowledgeable young man.
Adjectives are phrases that are used to characterize nouns or pronouns.
Gita, for example, is a stunning young lady.
In this case, the adjective "beautiful" is used to describe Gita.



Note:
i) An adjective is a word that further defines a noun. They may be proper adjectives, descriptive adjectives, qualitative or attributive adjectives, numerical adjectives, demonstrative adjectives, distributive adjectives, interrogative adjectives, possessive adjectives, and so on.
ii) A pronoun is a term that can be used alone as a noun phrase to refer to the discourse participants (e.g., I, you) or to someone or something specified elsewhere in the discourse (e.g. she, it, this )