How many letters does the top answer for “form the substance of” have?

The most common answer is compose (7 letters).

Crossword clue: form the substance of

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

compose 7 letters wn-def

form the substance of

a substance that forms a gel with water 50% similar → hydrocolloid

like the brain in form or substance. 50% similar → cerebriform

without material form or substance 50% similar → incorporeal