tipper vs bestower

tipper and bestower both are nouns.

Word	Noun	Adjective	Verb	Adverb
tipper	Yes	No	No	No
bestower	Yes	No	No	No

As nouns, bestower is a hypernym of tipper; that is, bestower is a word with a broader meaning than tipper:

Other hypernyms of tipper include conferrer, donor, giver, presenter.

tipper (noun)	bestower (noun)
truck whose contents can be emptied without handling; the front end of the platform can be pneumatically raised so that the load is discharged by gravity	person who makes a gift of property
a person who leaves a tip