I may stand corrected ,but for years I have always ,used fid for rope and marline for wire ,on google there are lots of different views on what a marline spike is used for ,yes I know about the marline hitch ,this is one of the extracts from google
A marlinspike is a tool used for tasks such as unlaying rope for splicing, untying knots, ... It is a polished cone tapered to a rounded or flattened point