building vs skeletal frame

building and skeletal frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
building	Yes	No	No	No
skeletal frame	Yes	No	No	No

building (noun)	skeletal frame (noun)
the act of constructing something	the internal supporting structure that gives an artifact its shape
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