Real Dictionary

pronoun
countable noun: A pronoun is a word that you use to refer to someone or something when you do not need to use a noun, often because the person or thing has been mentioned earlier. Examples are 'it', 'she', 'something', and 'myself'.

pronoun in American English
any of a small class of relationship or signal words that assume the functions of nouns within clauses or phrases while referring to other locutions within the sentence or in other sentences: I, you, them, it, ours, who, which, myself, anybody, etc. are p
noun: any member of a small class of words found in many languages that are used as replacements or substitutes for nouns and noun phrases, and that have very general reference, as I, you, he, this, who, what. Pronouns are sometimes formally distinguished from

pronoun in British English
noun: one of a class of words that serves to replace a noun phrase that has already been or is about to be mentioned in the sentence or context