serration vs notch

serration and notch both are nouns.

Word	Noun	Adjective	Verb	Adverb
serration	Yes	No	No	No
notch	Yes	No	Yes	No

As nouns, notch is a hypernym of serration; that is, notch is a word with a broader meaning than serration:

serration: a single notch in a row of notches
notch: a V-shaped or U-shaped indentation carved or scratched into a surface

serration (noun)	notch (noun)
a single notch in a row of notches	a small cut
a row of notches	a V-shaped or U-shaped indentation carved or scratched into a surface
the condition of being serrated	the location in a range of mountains of a geological formation that is lower than the surrounding peaks
	a V-shaped indentation

serration (verb)	notch (verb)
	notch a surface to record something
	cut or make a notch into