mark off vs tick

mark off is not a noun while tick is a noun.

Word	Noun	Adjective	Verb	Adverb
mark off	No	No	Yes	No
tick	Yes	No	Yes	No

As verbs, mark off and tick are synonyms defined as:

Other synonyms of mark off include check, check off, mark, tick off.

mark off (noun)	tick (noun)
	any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
	a light mattress
	a mark indicating that something has been noted or completed etc.
	a metallic tapping sound

mark off (verb)	tick (verb)
set boundaries to and delimit	put a check mark on or near or next to
put a check mark on or near or next to	sew
	make a clicking or ticking sound
	make a sound like a clock or a timer