tying up vs moorage

tying up and moorage both are nouns.

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

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

Other synonyms of tying up include dockage, docking.

tying up (noun)	moorage (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