MSG vs flavourer

MSG and flavourer both are nouns.

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

As nouns, flavourer is a hypernym of MSG; that is, flavourer 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
flavourer: something added to food primarily for the savor it imparts

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

MSG (noun)	flavourer (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