red pepper vs flavouring

red pepper and flavouring both are nouns.

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

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

red 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 red pepper include flavorer, flavoring, flavourer, seasoner, seasoning.

red 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
very hot red peppers; usually long and thin; some very small