The possessive case of Helen

The possessive case of Helen

Nouns and adjectives are Helen's

What's the difference between noun modifying noun and possessive of in English

Noun modifying noun: usually, the former modifying noun is also a feature of the latter noun, which is a property of the modified noun. For example, the woman teacher gold watch gold table possessive of

What is the difference between noun modifying noun and possessive of in English
For example, are there any differences between sports meeting and meeting of sports

The noun as modifier indicates the characteristic property, while the possessive of indicates the attribute
Sports meeting meeting of sports