victuals vs fast food

victuals and fast food both are nouns.

Word	Noun	Adjective	Verb	Adverb
victuals	Yes	No	No	No
fast food	Yes	No	No	No

As nouns, fast food is a hyponym of victuals; that is, fast food is a word with a more specific, narrower meaning than victuals:

victuals: a source of materials to nourish the body
fast food: inexpensive food (hamburgers or chicken or milkshakes) prepared and served quickly

victuals (noun)	fast food (noun)
any substance that can be used as food	inexpensive food (hamburgers or chicken or milkshakes) prepared and served quickly
a source of materials to nourish the body
a stock or supply of foods