[noun] [C] - someone who watches something that is happening in a public place but is not involved in itA crowd of curious onlookers soon gathered to see what was happening.(figurative) I don't want to be just an onlooker - I want to be directly involved in the project.
ONLOOKER
Meaning of ONLOOKER in English
Cambridge English vocab. Кембриджский английский словарь. 2012