Words of different category (nouns, verb, adjective or adverbs) can be united to form nouns of this type. They usually have two parts. The first part of this type of noun tells you what kind of object or person it is or what the purpose of the noun is. The second part of this type of noun speaks about the object or person in question. These types of nouns often have a more specific meaning.
adjective + adjective
1. blue + green = blue-green
Noun + noun
1. Bed = room = bedroom
2. Water + tank = water-tank
3. motor + cycle = motorcycle
4. printer + cartridge = printer-cartridge
5. Traffic + jam = traffic-jam
6. Key + board = keyboard
7. Tooth + paste = Toothpaste
8. Foot + ball = Football
9. Fish + tank = fish tank
10. Birth + day = birthday
To make a possessive form of the plural form compound word, you usually have to add an apostrophe “s” at the end of the noun. You will get a little strange with two “s” sounds close together.
The compound noun can be written either as a single word or as a word with a hyphen or as two words. There are no clear written rules for this formation of this type of nouns. A good rule of thumb is to write the most common one as one word and the others as two words.
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