Compound Noun or Adjective?
Background
Noun and Adjective
His very bad idea to gamble his money made him poor.
Ill-advised
His ill-advised idea to gamble his money made him poor.
Blue
Sky-blue
Blood-red
Lifetime supply
Noun
I think that the idea that his dog ate his homework is quite unbelievable.
I think that the idea that his dog ate his homework is far-fetched.
Red
Blood-red
Company car
Noun + noun
Green screen
Noun
The situation these days is much different from how things were a hundred years ago.
Present-day
The present-day situation is much different from how things were a hundred years ago.
Green
Lime-green
Breaking News
Verb + Noun
Deep sea
Adjective
The play is quite long. It lasts four hours.
Four-hour
It's a four-hour play.
Nut-brown
Voice Recognition
Noun + Noun
State-of-the-art
Adjective
Backup
Don't lose that USB, it has the only copy of the files and there aren't any backups.
Black
Jet-black / pitch-black
Messed-up
Verb + Prep