wall vs coping stone

wall and coping stone both are nouns.

Word	Noun	Adjective	Verb	Adverb
wall	Yes	No	Yes	No
coping stone	Yes	No	No	No

wall (noun)	coping stone (noun)
an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure	a stone that forms the top of wall or building
an embankment built around a space for defensive purposes
a masonry fence (as around an estate or garden)
a layer of material that encloses space
(anatomy) a layer (a lining or membrane) that encloses a structure
anything that suggests a wall in structure or function or effect
a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
a difficult or awkward situation

wall (verb)	coping stone (verb)
surround with a wall in order to fortify