Is there a difference between a psychologist and a therapist ?

Labeling: Not all psychologists choose to be therapists but pursue other interests. Not all therapists when through the pathway taken by psychologists. In the US many therapists trained initially in social work, medical social work or other disciplines. The rules defining who can call themselves a therapist are defined by your country/state.

Therapy vs meds: Speaking very generally, most psychologists hold either a PhD or a PsyD degree (I hold both) and practice psychotherapy. Psychiatrists hold either an MD or a DO degree, and they prescribe psychotropic medications, and generally do not do all that much therapy these days, but years ago psychiatrists would do both. Social workers, psychiatrists, and psychologists all do counseling/psychotherapy.

PSYCHOLOGIST: Anyone can call themselves a therapist. A Clinical Psychologist has a PhD degree which involves many years of training plus postdoctoral training and a licensing exam.