lemon grass vs flavoring

lemon grass and flavoring both are nouns.

Word	Noun	Adjective	Verb	Adverb
lemon grass	Yes	No	No	No
flavoring	Yes	No	No	No

As nouns, flavoring is a hypernym of lemon grass; that is, flavoring is a word with a broader meaning than lemon grass:

lemon grass: fragrant leaves of Cymbopogon citratus, used in cooking, in traditional medicine and are often found in herbal supplements and teas.
flavoring: something added to food primarily for the savor it imparts

Other hypernyms of lemon grass include flavorer, flavourer, flavouring, seasoner, seasoning.

lemon grass (noun)	flavoring (noun)
fragrant leaves of Cymbopogon citratus, used in cooking, in traditional medicine and are often found in herbal supplements and teas.	something added to food primarily for the savor it imparts
a tropical grass native to India and Sri Lanka
an aromatic oil that smells like lemon and is widely used in Asian cooking and in perfumes and medicines