rice soup vs soup

rice soup and soup both are nouns.

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

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

rice soup: soup containing rice and vegetables.
soup: liquid food especially of meat or fish or vegetable stock often containing pieces of solid food

rice soup (noun)	soup (noun)
soup containing rice and 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

rice soup (verb)	soup (verb)
	dope (a racehorse)