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

The most common answer is groundbreaking (14 letters).

Crossword clue: another word for innovative

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

groundbreaking 14 letters gen-syn

the ceremonial breaking of the ground to formally begin a construction project

innovational 12 letters gen-syn

being or producing something like nothing done or experienced or created before

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