salinity vs saltiness

salinity and saltiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
salinity	Yes	No	No	No
saltiness	Yes	No	No	No

As nouns, saltiness is a hypernym of salinity; that is, saltiness is a word with a broader meaning than salinity:

As nouns, salinity and saltiness are synonyms defined as:

salinity and saltiness: the taste experience when common salt is taken into the mouth

Other synonyms of salinity include salt.

salinity (noun)	saltiness (noun)
the relative proportion of salt in a solution	the property of containing salt (as a compound or in solution)
the taste experience when common salt is taken into the mouth	the taste experience when common salt is taken into the mouth
	language or humor that is down-to-earth