pier vs wharf

pier and wharf both are nouns.

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

As nouns, pier and wharf are synonyms defined as:

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

Other synonyms of pier include dock, wharfage.

pier (noun)	wharf (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)