P - Psychology, Psychopathy, Psychotherapy, Psychoanalysis.

Every word with two compounds, the first being Psycho-, is Greek and means something that has to do with the soul. Some examples:

Psychology. From Ancient Greek ψυχή, psukhē, soul + -logia, study of something.

Psychopathy. From Ancient Greek ψυχή, psukhē, soul +  πάθος, pathos, suffering.

Psychotherapy. From Ancient Greek ψυχή, psukhē, soul + θεραπεία, therapia, service, medical treatment, from θεραπεύω, therapeuō, I serve, treat medically.

Psychoanalysis. From Ancient Greek ψυχή, psukhē, soul + ἀνάλυσις, analisis, from ἀναλύω, analiō, I unravel, investigate.