A flag specialist is called a vexillologist.
A bird specialist is called an orithologist
a specialist in the study of substances attained by mining. its called mineralogist
A vocal specialist is called a Speech Therapist
Such a specialist is known by the title of podiatrist or chiropodist.
A climatologist
no
secatarist
skullologist
A. Pediatricians
A "Roundsman"
urologist