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I was wondering why we do not use 's for some nouns that belong to other nouns? For example:

book cover or book's cover

and

house's door or house door

Which one is right ?

Varun Nair
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Hossein
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2 Answers2

5

They are both correct.

A book's cover is called a book cover

Book in book cover acts more like an adjective describing cover just as

front cover
back cover
cloud cover
buggy cover

these are saying what the cover is associated with. It is possible the usage of book's cover changed to book cover sometime in the past.

Though they both refer to the same thing: the dust jacket of a book

book's cover

emphasizes the book

book cover

emphasizes the cover

Peter
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2

Peter has done a pretty good job explaining how this works. As for the why, that's a trickier question.

In X's Y, X's is a possessive: the Y belongs to the X.
In X Y, X is a noun adjunct: X acts like an adjective describing the Y.

Here's a discussion of the difference on English.SE.

To give some examples of usage, I would say that house's door means "a door belonging to a house" while house door means "a door of the type house". A door is only a house's door if it actually belongs to or is associated with a particular house, but it could be a house door even if it's never belonged to any house - for example, maybe it is at the hardware store waiting for someone to buy it and put it on their house.

Sometimes you can use either one:

Approaching the scene of the explosion, he saw a car door lying in the middle of the street.

works just as well as

Approaching the scene of the explosion, he saw a car's door lying in the middle of the street.

It works both ways because it was a door of the type 'car' and it was a door that had belonged (presumably) to a specific car.

stangdon
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