How many letters does the top answer for “a substance capable of reducing friction by making surfaces smooth or slippery” have?

The most common answer is lube (4 letters).

Crossword clue: a substance capable of reducing friction by making surfaces smooth or slippery

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

lube 4 letters wn-def

a substance capable of reducing friction by making surfaces smooth or slippery

lubricant 9 letters wn-def

a substance capable of reducing friction by making surfaces smooth or slippery

lubricator 10 letters wn-def

a substance capable of reducing friction by making surfaces smooth or slippery