How many letters does the top answer for “island in saint lucia” have?

The most common answer is saintlucia (10 letters).

Crossword clue: island in saint lucia

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

saintlucia 10 letters wd-fact-v3

a person from saint lucia 50% similar → saintlucian

capital of saint lucia 50% similar → castries

city in saint lucia 50% similar → castries

mountain in saint lucia 50% similar → grospiton, pitons, qualibou