MSG vs seasoner

MSG and seasoner both are nouns.

Word	Noun	Adjective	Verb	Adverb
MSG	Yes	No	No	No
seasoner	Yes	No	No	No

As nouns, seasoner is a hypernym of MSG; that is, seasoner is a word with a broader meaning than MSG:

MSG: white crystalline compound used as a food additive to enhance flavor; often used in Chinese cooking
seasoner: something added to food primarily for the savor it imparts

Other hypernyms of MSG include flavorer, flavoring, flavourer, flavouring, seasoning.

MSG (noun)	seasoner (noun)
white crystalline compound used as a food additive to enhance flavor; often used in Chinese cooking	something added to food primarily for the savor it imparts
	a cook who uses seasonings