What are the best answers for “the grammatical relation created by an intransitive verb”?

intransitiveness, intransitivity.

How many letters does the top answer for “the grammatical relation created by an intransitive verb” have?

The most common answer is intransitiveness (16 letters).

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

intransitiveness 16 letters wn-def

the grammatical relation created by an intransitive verb

intransitivity 14 letters wn-def

the grammatical relation created by an intransitive verb

the grammatical relation created by a transitive verb 67% similar → transitiveness, transitivity