Coal, pencil lead, and diamonds all contain carbon.
Pencil lead does not have coal. Pencil lead contains graphite.
Graphite is used to make pencil lead, but it is not a form of coal.
Yes. Other allotropes include coal and graphite, such as you might find in a pencil as 'lead'.
Carbon. Diamond is the crystalline form, while graphite (pencil "lead") is the powdered form.
Coal, diamonds, pencil lead, etc...