dockage vs tying up

dockage and tying up both are nouns.

Word	Noun	Adjective	Verb	Adverb
dockage	Yes	No	No	No
tying up	Yes	No	No	No

As nouns, dockage and tying up are synonyms defined as:

Other synonyms of dockage include docking, moorage.

dockage (noun)	tying up (noun)
the act of securing an arriving vessel with ropes	the act of securing an arriving vessel with ropes
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