Form and rules
How it works
1
Noun+noun compounds often classify type/function: a company policy, a coffee machine, a customer service team.
2
Possessive 's is common with people, organizations, countries and time expressions: the manager's office, the company's strategy.
3
Of-phrases are common with things, abstract relationships and long noun phrases: the roof of the building.
4
Plural possessives place the apostrophe after regular plural -s: the employees' lounge; irregular plurals take 's: children's books.
5
Meaning can differ: a children's hospital is a hospital for children, while the children's hospital might mean a specific hospital belonging/connected to known children in context.