colouring vs foodstuff

colouring and foodstuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
colouring	Yes	No	No	No
foodstuff	Yes	No	No	No

As nouns, foodstuff is a hypernym of colouring; that is, foodstuff is a word with a broader meaning than colouring:

Other hypernyms of colouring include food product.

colouring (noun)	foodstuff (noun)
the act or process of changing the color of something	(usually plural) consumer goods sold by a grocer
a visual attribute of things that results from the light they emit or transmit or reflect	a substance that can be used or prepared for use as food
a digestible substance used to give color to food