"Forebitter" been used AFAIK ever since I first heard any discussion of "what is folk" to describe a song sung among sailors not as a work song but as entertainment outside working time, and probably back as far as the revival.

Some seem to say that "Lowlands Away" was a capstan shanty, but I'm damned if I've ever heard it sing with a rhythm disposed to assist in plodding round a capstan (a classic example of which would be "Johnson Girls")