How many letters does the top answer for “half a year; a period of 6 months” have?

The most common answer is semester (8 letters).

Crossword clue: half a year; a period of 6 months

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

semester 8 letters wn-def

half a year; a period of 6 months

a month of the year 50% similar → april, august, december

a period of 10 years 50% similar → decade, decennary, decennium

a period of 100 years 50% similar → century

a period of 2 months 50% similar → bimester