Chanteys are a class of deep water sailor work songs. Rowing songs are just that- work songs used for rowing but not chanteys.Farm and field songs and waulking songs are work songs but not chanteys.
Chanteys are used for basically two jobs; heaving & hauling. The exception is the furling or bunting chantey which involves a quick upward lifting thrust of the sail onto the yard.
Hugill explained it years ago in Shanties From the Seven Seas and he publicly lectured on it almost 'til the day he died.