summerhouse vs building

summerhouse and building both are nouns.

Word	Noun	Adjective	Verb	Adverb
summerhouse	Yes	No	No	No
building	Yes	No	No	No

As nouns, building is a hypernym of summerhouse; that is, building is a word with a broader meaning than summerhouse:

summerhouse: a small roofed building affording shade and rest
building: a structure that has a roof and walls and stands more or less permanently in one place

Other hypernyms of summerhouse include edifice.

summerhouse (noun)	building (noun)
a small roofed building affording shade and rest	the act of constructing something
	the commercial activity involved in repairing old structures or constructing new ones
	a structure that has a roof and walls and stands more or less permanently in one place
	the occupants of a building