overcasting vs whipstitch

overcasting and whipstitch both are nouns.

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

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

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

Other hypernyms of overcasting include whipping, whipstitching.

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