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

2 senses of headroom

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
headroom, dynamic headroom -- (the capacity of a system to reproduce loud sounds without distortion)
       => high fidelity, hi-fi -- (the reproduction of sound with little or no distortion)