sour salt vs seasoning

sour salt and seasoning both are nouns.

Word	Noun	Adjective	Verb	Adverb
sour salt	Yes	No	No	No
seasoning	Yes	No	No	No

As nouns, seasoning is a hypernym of sour salt; that is, seasoning is a word with a broader meaning than sour salt:

Other hypernyms of sour salt include flavorer, flavoring, flavourer, flavouring, seasoner.

sour salt (noun)	seasoning (noun)
crystals of citric acid used as seasoning	the act of adding a seasoning to food
	something added to food primarily for the savor it imparts