building vs dry walling

building and dry walling both are nouns.

Word	Noun	Adjective	Verb	Adverb
building	Yes	No	No	No
dry walling	Yes	No	No	No

As nouns, dry walling is a hyponym of building; that is, dry walling is a word with a more specific, narrower meaning than building:

building (noun)	dry walling (noun)
the act of constructing something	the activity of building stone walls without mortar
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