What are terms such as "anywhere" or "anyone" called?

Question

for instance, "dog" is called a common noun,
"Lassie" is called a proper noun,
"it" is called a pronoun,
What are the terms "anyone", "anybody", "anything", etc. called?

Answer 1

any : adjective, pronoun, adverb
anybody/anyone : pronoun
anyhow : adverb, adjective
anything : pronoun, adverb
anyway : adverb
anywhere : adverb

Answer 2

those are also nouns just like everybody and nobody..nowhere and everywhere..nothing and everything

they can also be known as prounouns and idioms, but they are mainly nouns