keepsake vs party favor

keepsake and party favor both are nouns.

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

As nouns, party favor is a hyponym of keepsake; that is, party favor is a word with a more specific, narrower meaning than keepsake:

keepsake: something of sentimental value
party favor: souvenir consisting of a small gift given to a guest at a party

Other hyponyms of keepsake include love-token, favor, favour, party favour.

keepsake (noun)	party favor (noun)
something of sentimental value	souvenir consisting of a small gift given to a guest at a party