The difference between Doctor and Veterinarian

When used as nouns, doctor means a physician, whereas veterinarian means a medical doctor who treats animals.

Doctor is also verb with the meaning: to act as a medical doctor to.

Veterinarian is also adjective with the meaning: veterinary.

check bellow for the other definitions of Doctor and Veterinarian

Doctor as a noun:

A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are D.O., DPM, M.D., DMD, DDS, DPT, DC, Pharm.D., in the US or MBBS in the UK.

Examples:

"If you still feel unwell tomorrow, see your doctor."
Doctor as a noun:

A person who has attained a doctorate, such as a Ph.D. or Th.D. or one of many other terminal degrees conferred by a college or university.
Doctor as a noun:

A veterinarian; a medical practitioner who treats non-human animals.
Doctor as a noun:

a person who has special knowledge or talents to manipulate or arrange transactions.
Doctor as a noun (obsolete):

A teacher; one skilled in a profession or a branch of knowledge; a learned man.
Doctor as a noun (dated):

Any mechanical contrivance intended to remedy a difficulty or serve some purpose in an exigency.

Examples:

"the doctor of a calico-printing machine, which is a knife to remove superfluous colouring matter"

"the doctor, or auxiliary engine, also called "donkey engine"
Doctor as a noun:

A fish, the friar skate.

Doctor as a verb (transitive):

To act as a medical doctor to.

Examples:

"Her children doctored her back to health."
Doctor as a verb (intransitive, humorous):

To act as a medical doctor.
Doctor as a verb (transitive):

To make (someone) into an (academic) doctor; to confer a doctorate upon.
Doctor as a verb (transitive):

To physically alter (medically or surgically) a living being in order to change growth or behavior.

Examples:

"They doctored their apple trees by vigorous pruning, and now the dwarfed trees are easier to pick."

"We may legally doctor a pet to reduce its libido."
Doctor as a verb (transitive):

To genetically alter an extant species.

Examples:

"Mendel's discoveries showed how the evolution of a species may be doctored."
Doctor as a verb (transitive):

To alter or make obscure, as with the intention to deceive, especially a document.

Examples:

"To doctor the signature of an [[instrument]] with intent to defraud is an example of [[forgery]]."
Doctor as a verb (intransitive, obsolete):

To take medicine.

Veterinarian as a noun (now, US):

A medical doctor who treats animals.