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Help the journalist finish her article about a chaotic baking competition.
During the awards ceremony, the _________________________ demanded a recount of the votes, while the _________________________ in the audience started throwing handfuls of flour at the judges.
The correct answers are runners-up and grown-ups.
In the compound noun runner-up, "runner" is the head noun, so it takes the plural "-s" (runners-up).
However, grown-up is made entirely of an adjective (grown) and a preposition (up). When a compound noun lacks a clear head noun, we simply add "-s" to the very end of the word (grown-ups).