headway vs room

headway and room both are nouns.

Word	Noun	Adjective	Verb	Adverb
headway	Yes	No	No	No
room	Yes	No	Yes	No

As nouns, room is a hypernym of headway; that is, room is a word with a broader meaning than headway:

Other hypernyms of headway include elbow room, way.

headway (noun)	room (noun)
forward movement	an area within a building enclosed by walls and floor and ceiling
vertical space available to allow easy passage under something	the people who are present in a room
	space for movement
	opportunity for

headway (verb)	room (verb)
	live and take one's meals at or in