if I use the word "official" as a noun, then does it have some difference with the word "officer" ??
There are three major officers, head official, deputy official and other officer along with the people.
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A. An officer:
- a person who is in a position of authority in the armed forces: army / air- force / naval officers
- a person who is in a position of authority in the government or a large organization
- (used as a form of address) = POLICE-OFFICER
- a title for a police officer
Oxford Learner's Dictionary
B. An official:
- Noun (often in compounds) a person who is in a position of authority in a large organization. For example, My father has been an economic official in Vina-milk company in Vietnam.
- Adjective. Connected with a work of some person who has a position of authority. For example, as a financial manager my father has official responsibility to monitor all financial activities and movements of the money in his company.