cayenne pepper vs flavouring

cayenne pepper and flavouring both are nouns.

Word	Noun	Adjective	Verb	Adverb
cayenne pepper	Yes	No	No	No
flavouring	Yes	No	No	No

As nouns, flavouring is a hypernym of cayenne pepper; that is, flavouring is a word with a broader meaning than cayenne pepper:

cayenne pepper: ground pods and seeds of pungent red peppers of the genus Capsicum
flavouring: something added to food primarily for the savor it imparts

Other hypernyms of cayenne pepper include flavorer, flavoring, flavourer, seasoner, seasoning.

cayenne pepper (noun)	flavouring (noun)
ground pods and seeds of pungent red peppers of the genus Capsicum	something added to food primarily for the savor it imparts
a long and often twisted hot red pepper
plant bearing very hot and finely tapering long peppers; usually red