How many letters does the top answer for “moving toward the north” have?

The most common answer is northbound (10 letters).

Crossword clue: moving toward the north

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

northbound 10 letters wn-def

moving toward the north

northward 9 letters wn-def

in a northern direction

moving toward the east 50% similar → eastbound, eastward

moving toward the south 50% similar → southbound, southward

moving toward the west 50% similar → westbound, westerly, westward