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

The most common answer is dielectric (10 letters).

Crossword clue: another word for nonconductor

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

dielectric 10 letters gen-syn

a material such as glass or porcelain with negligible electrical or thermal conductivity

insulator 9 letters gen-syn

a material such as glass or porcelain with negligible electrical or thermal conductivity

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

another word for terms 50% similar → footing

another word for under 50% similar → nether

another word for word 50% similar → phrase