audience / spectator / viewer / sightseer / onlooker / witness

B1 additional task

audience /ˈɔːdiəns | ˈɑːdiəns/

a group of people listening to a performance, speech etc

spectator /spekˈteɪtə | ˈspekteɪtər/

Thousands of spectators cheered the teams loudly

a person who watches an activity, especially a sports event, without taking part

viewer /ˈvjuːə | ˈvjuːər/

Millions of viewers will be glued to their sets for this match.

a person who watches something, especially television

sightseer /ˈsaɪtsiːə | ˈsaɪtsiːər/

1.Fairs, festivals are held throughout the year and attract many sightseers.

2.Boats carry sightseers round the island.

a person who is visiting interesting places, especially on holiday

onlooker /ˈɒnˌlʊkə $ ˈɑːnˌlʊkə/

A crowd of curious onlookers soon gathered to see what was happening.

someone who watches something that is happening in a public place but is not involved in it

witness /ˈwɪtnəs/

According to (eye) witnesses, the robbery was carried out by two teenage boys

a person who sees an event happening, especially a crime or an accident

be witness to sth

She was witness to the tragic event.

to see something happen