grandfather clock vs casing

grandfather clock and casing both are nouns.

Word	Noun	Adjective	Verb	Adverb
grandfather clock	Yes	No	No	No
casing	Yes	No	No	No

grandfather clock (noun)	casing (noun)
a pendulum clock enclosed in a tall narrow case	the enclosing frame around a door or window opening
	the housing or outer covering of something
	the outermost covering of a pneumatic tire