What are compound nouns?

I need your help once again. I’m a little bit confused. What are compound nouns? What would be the criteria that would classify two words as compound nouns?

If you’re given words like: playground, policeman, plastic surgery and taxi stand, which ones would be considered compound?

Thanks a lot in advance! :slight_smile:

All your examples are compound nouns, which are combinations of two or more words. For more information, you can have a look at:

bbc.co.uk/worldservice/learn … v155.shtml

Thanks, Ms. Conchita! I really appreciate it! :smiley: