How many letters does the top answer for “another word for flood” have?

The most common answer is inundation (10 letters).

Crossword clue: another word for flood

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

inundation 10 letters gen-syn

the rising of a body of water and its overflowing onto normally dry land

swamp 5 letters gen-syn

low land that is seasonally flooded; has more woody plants than a marsh and better drainage than a bog

another word for about 50% similar → approximately, roughly, some

another word for terms 50% similar → footing

another word for under 50% similar → nether

another word for word 50% similar → phrase