coloring vs food coloring

coloring and food coloring both are nouns.

Word	Noun	Adjective	Verb	Adverb
coloring	Yes	No	No	No
food coloring	Yes	No	No	No

As nouns, coloring and food coloring are synonyms defined as:

coloring and food coloring: a digestible substance used to give color to food

Other synonyms of coloring include colouring, food color, food colour, food colouring.

coloring (noun)	food coloring (noun)
the act or process of changing the color of something	a digestible substance used to give color to food
a visual attribute of things that results from the light they emit or transmit or reflect
a digestible substance used to give color to food