With GRAPHO (to write)
Dactylographier (Dactylo = doigt)
Photographier (Photos = lumière )

AVEC LOGOS (science, raison)
Psychologue (Psyché = âme)
Podologue (Podi = pied )
Gynécologue (Gynaika = femme)
Graphologue (un mélange des deux )

AVEC IATROS (médecin)
Pédiatre (Pédi = enfant)
Psychiatre (un mélange des deux )

These ar just a few examples. We could also add loads of other words, as for example those coming from gods and godesses.