Have I correctly used 'namely,' 'and,' and 'among others' in the given sentence?
The master of ceremonies introduced the guests who were former school personnel, namely Mrs. Thompson, Miss Lewis, and Mrs. Nelson, among others.
No. namely sounds like you are naming them all. among others sounds like you are not naming them all.
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No.
namely sounds like you are naming them all.
among others sounds like you are not naming them all.
The master of ceremonies introduced the guests who were former school personnel: Mrs. Thompson, Miss Lewis, and Mrs. Nelson, among others.
Rommelformer school personnel,
This is possible, but excessively formal. It would be more natural as school staff.