Learn That Word

Synonyms for Warning (same or very similar meaning)

WordNet sense 1 (cautionary advice about something imminent (especially imminent danger)):
admonition, monition, word of advice

WordNet sense 2 (serving to warn):
admonitory, cautionary, exemplary, monitory

WordNet sense 3 (deterring from action):
dissuasive


From the ODE community, based on WordNetadd/edit