tipper vs donor

tipper and donor both are nouns.

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

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

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

tipper (noun)	donor (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	(medicine) someone who gives blood or tissue or an organ to be used in another person (the host)