gash vs furrow

gash and furrow both are nouns.

Word	Noun	Adjective	Verb	Adverb
gash	Yes	No	Yes	No
furrow	Yes	No	Yes	No

As nouns, furrow is a hypernym of gash; that is, furrow is a word with a broader meaning than gash:

gash (noun)	furrow (noun)
a strong sweeping cut made with a sharp instrument	a long shallow trench in the ground (especially one made by a plow)
a trench resembling a furrow that was made by erosion or excavation	a slight depression or fold in the smoothness of a surface
a wound made by cutting

gash (verb)	furrow (verb)
cut open	hollow out in the form of a furrow or groove
	make wrinkled or creased
	cut a furrow into a columns