demonstrator
nounUK /ˈdemənstreɪtə/
US /ˈdemənstreɪtər/
A demonstrator is a person who shows how something works or who shows what they think in a group.
The demonstrator showed the class how to make a paper boat.
RELATED WORDS
OTHER MEANINGS
2. A person who shows how a machine or product works.
The demonstrator explained how the new robot vacuum cleans floors.
3. A person who joins a public protest or march.
The demonstrators held signs outside the town hall.
4. A person or thing that proves or shows something clearly.
The experiment was a demonstrator of how plants need sunlight.