cream vs sour cream

cream and sour cream both are nouns.

Word	Noun	Adjective	Verb	Adverb
cream	Yes	No	Yes	No
sour cream	Yes	No	No	No

As nouns, sour cream is a hyponym of cream; that is, sour cream is a word with a more specific, narrower meaning than cream:

cream (noun)	sour cream (noun)
toiletry consisting of any of various substances in the form of a thick liquid that have a soothing and moisturizing effect when applied to the skin	artificially soured light cream
the part of milk containing the butterfat
the best people or things in a group

cream (verb)	sour cream (verb)
add cream to one's coffee, for example
make creamy by beating
remove from the surface
put on cream, as on one's face or body
beat thoroughly and conclusively in a competition or fight