nearby and passerby vs near-by and passer-by


Senior Member
When should we hyphenate nearby and passerby ?
in the following context it is hyphenated
"Next, I asked him to relax. Meanwhile one of the passers-by phoned the emergency services, and a few minutes later an ambulance arrived and took him to a near-by hospital."

these two words are without hyphens in the dictionary.
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