tie up vs knitting

tie up is not a noun while knitting is a noun.

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

tie up (noun)	knitting (noun)
	creating knitted wear
	needlework created by interlacing yarn in a series of connected loops using straight eyeless needles or by machine

tie up (verb)	knitting (verb)
secure with or as if with ropes
finish the last row
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