dem‧on‧stra‧tor AC /ˈdemənstreɪtə $ -ər/ noun [countable]
[Word Family: noun: demonstration, demonstrator; adverb: demonstrably, demonstratively; adjective: demonstrable, demonstrative; verb: demonstrate]

1. someone who takes part in a demonstration:
anti-war demonstrators

2. someone who shows people how to do something or how something works

[TahlilGaran] Dictionary of Contemporary English ▲

demonstrator
noun
ADJ. angry Angry demonstrators threw stones.
peaceful | anti-government, pro-democracy, etc.
QUANT. crowd, group Police opened fire on a crowd of peaceful demonstrators.
VERB + DEMONSTRATOR disperse Troops were brought in to disperse the demonstrators.
clash with, fire on, open fire on, use sth against Water cannon and tear gas were used against the demonstrators.
DEMONSTRATOR + VERB gather The demonstrators had gathered in the cathedral square.
march Demonstrators marched on the parliament building.
protest demonstrators protesting against the lack of housing
call for sth, demand sth demonstrators calling for the removal of the government
disperse The demonstrators dispersed when the soldiers arrived.
attack sb, clash with sb Demonstrators clashed with government soldiers in the country's ca
storm sth Demonstrators then tried to storm the police headquarters.
PHRASES clashes between police and demonstrators

[TahlilGaran] Collocations Dictionary ▲