How many letters does the top answer for “home of city of capitals” have?

The most common answer is moscow (6 letters).

Crossword clue: home of city of capitals

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

moscow 6 letters wd-fact-v3

a city of central European Russia; formerly capital of both the Soviet Union and Soviet Russia; since 1991 the capital o

capital of vatican city 50% similar → vaticancity

city in capital district 50% similar → asuncion

city in capital governorate 50% similar → manama

city in capital region 50% similar → seltjarnarnes

home of city palace 50% similar → potsdam

home of marina city 50% similar → chicago

which city is the capital of switzerland 50% similar → bern