dacha vs country house

dacha and country house both are nouns.

Word	Noun	Adjective	Verb	Adverb
dacha	Yes	No	No	No
country house	Yes	No	No	No

As nouns, country house is a hypernym of dacha; that is, country house is a word with a broader meaning than dacha:

dacha: Russian country house
country house: a house (usually large and impressive) on an estate in the country

dacha (noun)	country house (noun)
Russian country house	a house (usually large and impressive) on an estate in the country