Question

what category of words is here that makes a hyphen useful?changing-room  / changing room

Accepted Answer

ing formchanging-room makes it clear that the room is notchanging.)Read more at http://www.grammar-monster.com/lessons/hyphens_in_compound_nouns.htm#MP1BzlWqzEgGLYTI.99

Front	what category of words is here that makes a hyphen useful? changing-room / changing room
Back	ing form changing-room makes it clear that the room is not changing.) Read more at http://www.grammar-monster.com/lessons/hyphens_in_compound_nouns.htm#MP1BzlWqzEgGLYTI.99

Makes Changing Room Room Category Words Hyphen Changing Ing