How many letters does the top answer for “directly facing each other” have?

The most common answer is opposite (8 letters).

Crossword clue: directly facing each other

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

opposite 8 letters wn-def

of leaves etc; growing in pairs on either side of a stem