cu·mu·lo·nim·bus
noun/ˌkjuːmələʊˈnɪmbəs/
/ˌkjuːmələʊˈnɪmbəs/
[uncountable] (specialist)- a high mass of thick cloud with a flat base, often seen during thunderstorms
积雨云（常伴有雷阵雨） Oxford Collocations DictionaryCumulonimbus is used before these nouns:- cloud