Last Updated : 04 Aug 2015.
Definition : When we put two or more words together to create a new word, we have made a compound noun.
Nouns of more than one word are called compound nouns.
noun + noun police officer ice-cream firefighter
noun + verb carwash haircut milkshake
verb + noun cross-road cookbook jump rope
adjective + noun black eye blue jeans hotdog
adverb + noun on-looker downtime overtime
adverb + verb input output upswing
Compound nouns can take three forms: hyphenated, solid and open.
When two or more words are connected by one or more hyphens, the result is a hyphenated compound. Some compound words are hyphenated to avoid being
misread or ambiguous.
sister-in-law jack-in-the-box state-of-the-art
shout-out mind-set five-year-old
Solid compounds are words that are used as a single unit of meaning and it is closed up as solid, or closed, compounds.
rollback restroom whatever
breakfast needlepoint slingshot OPEN COMPOUNDS
Sometimes no hyphenating or closing up is necessary to form a compound. Open compounds are words that are used as a single unit of meaning but are still written separately as two words.
wet nurse roller coaster whatever
sleeping bag first aid mug shot
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