Answer : 4. "Rant"
Explanation :

A "tirade" is a long, vehement speech or a stream of verbal abuse expressing strong disapproval or criticism. It often involves intense and harsh language directed towards a particular person, group, or situation. Choosing "rant" as the synonym for "tirade" is appropriate because a rant also signifies a loud, passionate, and often lengthy outburst of criticism or complaint.