wor ‧ ri ‧ er /ˈwʌriə $ ˈwɜːriər/ BrE AmE noun [countable]
[ Word Family: adjective : ↑ worried ≠ UNWORRIED , ↑ worrying , ↑ worrisome ; noun : ↑ worry , ↑ worrier ; adverb : ↑ worryingly , ↑ worriedly ; verb : ↑ worry ]
someone who often worries about things:
Her mother was a born worrier.