Real Dictionary

head
something wound in a connected series of loops [...]
the upper or front part of the body in vertebrates, including humans, that contains and protects the brain, eyes, mouth, and nose and ears when present [...]
countable noun: The head of a company or organization is the person in charge of it and in charge of the people in it.
countable noun: The head of a school is the teacher who is in charge.
countable noun: The head of something long and thin is the end which is wider than or a different shape from the rest, and which is often considered to be the most important part.
countable noun: You can use head to refer to your mind and your mental abilities.
countable noun: Your head is the top part of your body, which has your eyes, mouth, and brain in it.
singular noun: The head of a line of people or vehicles is the front of it, or the first person or vehicle in the line.
singular noun: The head of something is the highest or top part of it.
verb: If someone or something heads a line or procession, they are at the front of it.
verb: If something heads a list or group, it is at the top of it.
verb: If you head a department, company, or organization, you are the person in charge of it.