order code vs operation code

order code and operation code both are nouns.

Word	Noun	Adjective	Verb	Adverb
order code	Yes	No	No	No
operation code	Yes	No	No	No

As nouns, order code and operation code are synonyms defined as:

order code and operation code: the portion of a set of operation descriptions that specifies the operation to be performed; the set of operations in a computer

order code (noun)	operation code (noun)
the portion of a set of operation descriptions that specifies the operation to be performed; the set of operations in a computer	the portion of a set of operation descriptions that specifies the operation to be performed; the set of operations in a computer