interjection
US /ˌɪn.t̬ɚˈdʒek.ʃən/
UK /ˌɪn.t̬ɚˈdʒek.ʃən/

1.
an exclamation, especially as a part of speech (e.g., 'Oh!', 'Wow!', 'Alas!')
:
•
“Ouch!” he cried, after hitting his thumb with a hammer.
•
“Bravo!” shouted the audience after the performance.