Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun flashflood

1 sense of flashflood

Sense 1
flash flood, flashflood -- (a sudden local flood of great volume and short duration)
       => flood, inundation, deluge, alluvion -- (the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations")