How many letters does the top answer for “an island in the gulf of guinea that is part of equatorial guinea” have?

The most common answer is bioko (5 letters).

Crossword clue: an island in the gulf of guinea that is part of equatorial guinea

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

bioko 5 letters wn-def

an island in the Gulf of Guinea that is part of Equatorial Guinea

island in equatorial guinea 60% similar → annobonisland, bioko, corisco