the rules of two nouns combination.

There are no such rules.

CB

I guess you mean attributives. The first noun is read as an adjective:

baseball cap
house party
telephone number

By the way, I love your screen name.

what is CB?

thank you. Yes, I mean something like these. Is there any rule?

Silencio Tarsierthank you. Yes, I mean something like these. Is there any rule?

Not really, I don't think. There are teachers here who know much more about rules than I do. I can say that there are cases where the attributive sounds wrong, and a possessive or straight adjective is better. For example, we have girl power, a girl's bicycle and girlish laughter.

Silencio TarsierNormally, there should be a adj. followed by noun.But sometimes there is a noun followed by noun.I just want to know the rules of two-noun-combination.

Noun+noun composites occur when one noun modifies another noun as in "brick wall", "London college", "cotton shirt", "college student", etc. The first noun in such composites falls under the gen

Silencio Tarsier the rules of two-noun-combination.

There are no rules. Just learn the compound nouns as if they were single vocabulary items. The exact relationship between the two nouns is not fixed; it varies from one compound noun to another.

dog house (a little house for a dog)
bottle opener (a tool that opens bottles)
ring finger (the

BillJdon't fall for the common trap of calling the first word an adjective. It certainly is not

Yes, it is.

enoonYes, it is.

No, it's not.

I wonder how long we can keep this up!

enoonBillJdon't fall for the common trap of calling the first word an adjective. It certainly is notYes, it is.You clearly don't know the difference between word category and function

Nonsense - you clearly don't know the difference between category (party of speech) and function. In "brick wall" for example, "brick" belongs to the category noun and its functi