Synonyms of warn in English:

warn


See definition of warn

verb

1‘David had warned her that it would be late when he returned’

SYNONYMS
notify, alert, apprise, give notice, inform, tell, let someone know, make someone aware, give a warning to, give fair warning to, forewarn, put someone on guard, put someone on notice, remind
raise the alarm, sound the alarm
informal tip off, put wise

2‘police are warning museums and galleries to take extra precautions’

SYNONYMS
advise, exhort, urge, counsel, caution
put on the alert, put someone on guard