This is the 5507th most frequent Japanese word.
おしゃべり
Chatting; talkative; chatterbox.
Here, 'おしゃべり' is used as a noun to mean 'chatting, talking' a pastime or activity.
彼女はおしゃべりが大好きです。
She loves chatting.
In this sentence, 'おしゃべり' is functioning as a descriptor to imply 'being talkative or chatty', often describing someone's behavior.
あの子は少しおしゃべりすぎる。
That child is a bit too talkative.
Here, 'おしゃべり' is used as the verb form 'to chat' (おしゃべりする), describing the action of talking informally.