Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun headway

2 senses of headway

Sense 1
headroom, headway, clearance -- (vertical space available to allow easy passage under something)
       => room, way, elbow room -- (space for movement; "room to pass"; "make way for"; "hardly enough elbow room to turn around")

Sense 2
headway, head -- (forward movement; "the ship made little headway against the gale")
       => progress, progression, advance -- (a movement forward; "he listened for the progress of the troops")