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

The most common answer is sonography (10 letters).

Crossword clue: another word for ultrasound

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

sonography 10 letters gen-syn

using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to

ultrasonography 15 letters gen-syn

using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to

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

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another word for word 50% similar → phrase