moor vs tie up

moor is a noun but tie up is not a noun.

Word	Noun	Adjective	Verb	Adverb
moor	Yes	No	Yes	No
tie up	No	No	Yes	No

As verbs, moor and tie up are synonyms defined as:

Other synonyms of moor include berth.

moor (noun)	tie up (noun)
open land usually with peaty soil covered with heather and bracken and moss

moor (verb)	tie up (verb)
secure with cables or ropes	secure with or as if with ropes
secure in or as if in a berth or dock	finish the last row
come into or dock at a wharf	restrain from moving or operating normally
	secure in or as if in a berth or dock
	invest so as to make unavailable for other purposes