There are two reports available that list the fields defined on your site. The <a href=":entity-list" title="Entities field list report">Entities</a> report lists all your fields, showing the field machine names, types, and the entity types or sub-types they are used on (each sub-type links to the Manage fields page). If the <a href=":views">Views</a> and <a href=":views-ui">Views UI</a> modules are enabled, the <a href=":views-list" title="Used in views field list report">Used in views</a> report lists each field that is used in a view, with a link to edit that view.