wharf vs levee

wharf and levee both are nouns.

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

As nouns, levee is a hyponym of wharf; that is, levee is a word with a more specific, narrower meaning than wharf:

wharf: a platform built out from the shore into the water and supported by piles; provides access to ships and boats
levee: a pier that provides a landing place on a river

Other hyponyms of wharf include quay.

wharf (noun)	levee (noun)
a platform built out from the shore into the water and supported by piles; provides access to ships and boats	an embankment that is built in order to prevent a river from overflowing
	a pier that provides a landing place on a river
	a formal reception of visitors or guests (as at a royal court)