moorage vs tying up

moorage and tying up both are nouns.

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

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

Other synonyms of moorage include dockage, docking.

moorage (noun)	tying up (noun)
the act of securing an arriving vessel with ropes	the act of securing an arriving vessel with ropes
a place where a craft can be made fast
a fee for mooring