undercharge vs burster

undercharge and burster both are nouns.

Word	Noun	Adjective	Verb	Adverb
undercharge	Yes	No	Yes	No
burster	Yes	No	No	No

As nouns, burster is a hypernym of undercharge; that is, burster is a word with a broader meaning than undercharge:

Other hypernyms of undercharge include bursting charge, charge, explosive charge.

undercharge (noun)	burster (noun)
an insufficient charge	a quantity of explosive to be set off at one time
a price that is too low

undercharge (verb)	burster (verb)
charge (someone) too little money