overcasting vs whipstitching

overcasting and whipstitching both are nouns.

Word	Noun	Adjective	Verb	Adverb
overcasting	Yes	No	No	No
whipstitching	Yes	No	No	No

As nouns, whipstitching is a hypernym of overcasting; that is, whipstitching is a word with a broader meaning than overcasting:

overcasting: a long whipstitch or overhand stitch overlying an edge to prevent raveling
whipstitching: a sewing stitch passing over an edge diagonally

Other hypernyms of overcasting include whipping, whipstitch.

overcasting (noun)	whipstitching (noun)
a long whipstitch or overhand stitch overlying an edge to prevent raveling	a sewing stitch passing over an edge diagonally