dockage vs docking fee

dockage and docking fee both are nouns.

Word	Noun	Adjective	Verb	Adverb
dockage	Yes	No	No	No
docking fee	Yes	No	No	No

As nouns, dockage and docking fee are synonyms defined as:

dockage (noun)	docking fee (noun)
the act of securing an arriving vessel with ropes	a fee charged for a vessel to use a dock
landing in a harbor next to a pier where ships are loaded and unloaded or repaired; may have gates to let water in or out
a fee charged for a vessel to use a dock