vegetable soup vs soup

vegetable soup and soup both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable soup	Yes	No	No	No
soup	Yes	No	Yes	No

As nouns, soup is a hypernym of vegetable soup; that is, soup is a word with a broader meaning than vegetable soup:

vegetable soup: soup made with a variety of vegetables
soup: liquid food especially of meat or fish or vegetable stock often containing pieces of solid food

vegetable soup (noun)	soup (noun)
soup made with a variety of vegetables	liquid food especially of meat or fish or vegetable stock often containing pieces of solid food
	an unfortunate situation
	any composition having a consistency suggestive of soup

vegetable soup (verb)	soup (verb)
	dope (a racehorse)