fcp-* is related to FCP target protocol, i.e. presenting LUNs on a FC SAN
storage-adapter-* is related to FC initiator protocol, i.e. accessing FC based disks shelves and FlexArray LUNs, tape devices
On a NetApp system a given FC port is either an initiator or a target port, so depending on the role it will be shown in one or the other set of APIs.
Storage Architect, NetApp EMEA