IPA: //ˈmoʊtərkeɪd//
KK: /ˈmoʊtərˌkeɪd/
A group of vehicles traveling together, often for a special purpose or event, like a parade or to escort someone important.
The president's motorcade moved slowly through the streets, surrounded by security.
Motorcade is formed from "motor" (from Latin "movere", meaning to move) and "cade" (from Spanish "cortejo", meaning a procession). The word "motorcade" refers to a procession of vehicles, typically for an important person, that moves together.
Think of a group of vehicles that 'move' ('motor') together in a 'procession' ('cade') — that's what a motorcade is.
No commonly confused words.