Rant

Rant means to speak or complain loudly, angrily, and for a long time—often without calming down.

Simple meaning:

Rant = angry talking / long complaint

Examples:

“He went on a rant about bad internet service.” “She started ranting when things didn’t go her way.”

As a noun: “That was a long rant!”

Similar words: Complain Vent Go off