The arts is a term broader than "art". The arts encompasses visual arts, Painting, Sculpture and Architecture, performing arts, Music and Dance, and language arts, Literature which includes Poetry and Theater.
As many artistic disciplines involve aspects of different arts, the definitions of these terms could overlap to some degree.
Architecture by Frank Lloyd Wright
An Art critic is an specialist in evaluating the arts and writing critiques or reviews. Art Criticism is the study of art criteria for evaluating works of art.