In linguistics, we recognize three types of compound words: closed, open, and hyphenated. Open compounds include the like of shrinking violet, which would work for your bystander question.
It would be helpful to specify which type of compound you are looking for, although orthography varies
Carpetbagger is a completely different concept. A person from the northern states who went to the South after the Civil War to profit from the Reconstruction. Please don't label me a pedant.
It would be helpful to specify which type of compound you are looking for, although orthography varies
peashooter, capgun, thinktank, eggtimer, cowhide
a quiz question should have an answer
granted it's less common but it's still used fairly frequently.
Head 'em up, move 'em on
Move 'em out, head 'em up: