favor vs keepsake

favor and keepsake both are nouns.

Word	Noun	Adjective	Verb	Adverb
favor	Yes	No	Yes	No
keepsake	Yes	No	No	No

As nouns, keepsake is a hypernym of favor; that is, keepsake is a word with a broader meaning than favor:

Other hypernyms of favor include relic, souvenir, token.

favor (noun)	keepsake (noun)
an act of gracious kindness	something of sentimental value
souvenir consisting of a small gift given to a guest at a party
an advantage to the benefit of someone or something
an inclination to approve
a feeling of favorable regard