@ Compound Nouns

Do you know what is compound noun? Is "couchpotato" a compound noun? How do you make its plural, "couchspotato" or "couchpotatoes"?

Have a look to the following list of compound nouns:
...toothpaste /airplane /birth date /working hour / four-wheel drive / middle-age man / greenhouse effect / shoe lace / waterfall /fingerprint / hourglass...

Explanations:

a. Explanation and exercise 1 (Spanish version)

b. More complete explanation and dictionnary (English version)

Exercises:

2. Easy exercise

3. Not so easy

4. Polar bear