1. (noun) headroom, headway, clearance
vertical space available to allow easy passage under something
Synonyms: head, headroom, dynamic headroom, clearance, headway
2. (noun) headway, head
forward movement
Synonyms: headway, promontory, oral sex, headland, point, straits, clearance, capitulum, psyche, school principal, question, read/write head, forefront, pass, header, drumhead, mind, chief, headspring, head, nous, fountainhead, head teacher, caput, headroom, principal, heading, brain, head word, foreland, top dog
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Synonyms and Antonyms of 'headway' 
