larder vs still room

larder and still room both are nouns.

Word	Noun	Adjective	Verb	Adverb
larder	Yes	No	No	No
still room	Yes	No	No	No

As nouns, still room is a hyponym of larder; that is, still room is a word with a more specific, narrower meaning than larder:

larder: a small storeroom for storing foods or wines
still room: a pantry or storeroom connected with the kitchen (especially in a large house) for preparing tea and beverages and for storing liquors and preserves and tea etc

Other hyponyms of larder include stillroom.

larder (noun)	still room (noun)
a small storeroom for storing foods or wines	a pantry or storeroom connected with the kitchen (especially in a large house) for preparing tea and beverages and for storing liquors and preserves and tea etc
a supply of food especially for a household