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Demonstrator (Noun)

A teacher or teacher's assistant who demonstrates the principles that are being taught.

Nouns denoting people.

The demonstrator in the cooking class showed the students how to properly chop an onion without crying.
The math teacher used a demonstrator to help her explain complex algebraic equations to the class.
The demonstrator in the science lab helped the students conduct experiments and understand the underlying principles.
The art teacher's assistant was a skilled demonstrator who could show the students various techniques for painting and drawing.
The demonstrator in the language class helped the students practice their pronunciation by repeating words and phrases in the target language.

Someone who demonstrates an article to a prospective buyer.

Nouns denoting people.

The salesperson was also a skilled demonstrator, able to show the features of the new smartphone to potential customers.
As a demonstrator for the company, her job was to showcase the benefits of the new kitchen appliance at cooking shows and exhibitions.
The electronics store hired a team of demonstrators to work on the floor, helping customers understand how to use the complex devices.
The demonstrator at the gym showed me how to properly use the new exercise machine, helping me to get the most out of my workout.
The retailer hired a freelance demonstrator to promote their new line of cosmetics at the mall, where she could interact with a high volume of potential customers.