1. What is the name for the head of an orphanage?

2. What is the name for the head of an nursery school?

3. What is the name for the head of a day-care center?

4. What is the name for the head of a senior center?

5. What is the name for the head of a nursing home?

(Which one is a suitable title for each head? a manager, a director...)

number 5 is matron

1. The head of an orphanage is typically referred to as a director or superintendent. To find this information, you can start by searching for "head of an orphanage job title." This should bring up various sources, such as job descriptions, organization websites, or articles that mention the specific title used for the head of an orphanage.

2. The head of a nursery school is commonly known as a director or principal. To confirm this, you can search for "head of a nursery school job title" or browse websites of nursery schools to see how they refer to the person in charge.

3. The head of a daycare center can have different job titles depending on the organization. Common titles include director, manager, or coordinator. To verify the most suitable title, you can search for "head of a daycare center job title" or look into job postings and descriptions for daycare centers.

4. The head of a senior center is often called a director or manager. To find the appropriate title, you can search for "head of a senior center job title" or look up job descriptions and responsibilities of senior center leaders.

5. The head of a nursing home is generally referred to as a director or administrator. To confirm this, you can search for "head of a nursing home job title" or explore nursing home websites, job listings, or industry resources for information on the specific title used.

All your sentences are fine, but I'd use the word "director" instead of "head."