wall vs pier

wall and pier both are nouns.

Word	Noun	Adjective	Verb	Adverb
wall	Yes	No	Yes	No
pier	Yes	No	No	No

wall (noun)	pier (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 platform built out from the shore into the water and supported by piles; provides access to ships and boats
an embankment built around a space for defensive purposes	a support for two adjacent bridge spans
a masonry fence (as around an estate or garden)	(architecture) a vertical supporting structure (as a portion of wall between two doors or windows)
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)	pier (verb)
surround with a wall in order to fortify