Synonyms for Tell off:

n.

castigate, tear someone/something to pieces/shreds, tear apart, harangue, attack, savage, take/bring/hold someone to task. rebuke (noun)
censure, chide, reprimand.
tell off (noun)
brush down.

v.

admonish (verb)
reprimand.
berate (verb)
castigate.
censure (verb)
tear apart, attack.
tell off (verb)
chide, censure.

Other synonyms:

censure, castigate. harangue. tear apart. savage. attack. Other relevant words:
castigate, censure, chide, reprimand, attack.