wharf vs pier

wharf and pier both are nouns.

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

As nouns, wharf and pier are synonyms defined as:

wharf and pier: a platform built out from the shore into the water and supported by piles; provides access to ships and boats

Other synonyms of wharf include dock, wharfage.

wharf (noun)	pier (noun)
a platform built out from the shore into the water and supported by piles; provides access to ships and boats	a platform built out from the shore into the water and supported by piles; provides access to ships and boats
	a support for two adjacent bridge spans
	(architecture) a vertical supporting structure (as a portion of wall between two doors or windows)