Special words or expressions that are used by a particular profession and are difficult for others to understand are called:
terminology
jargon
edicts
acronyms

Jargon

Explanation:

Literally, Jargons can be seen as terms that describes the use of certain expressions; these expressions could either be phrases or words and they are used in reference to a particular situation in a particular profession, or trade.

As mentioned in the definition above, these specialized terms relays hidden meanings between the professionals that are widely accepted and understood in that field.

Examples of medical Jargons are;

Acute - A condition that comes on suddenly

Agonal - Term to signify a major, negative change in a patient's condition

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