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

The most common answer is instillation (12 letters).

Crossword clue: another word for instillment

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

instillation 12 letters gen-syn

the introduction of a liquid (by pouring or injection) drop by drop

instilment 10 letters gen-syn

the introduction of a liquid (by pouring or injection) drop by drop

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