knit vs tie up

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

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

knit (noun)	tie up (noun)
needlework created by interlacing yarn in a series of connected loops using straight eyeless needles or by machine
a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side
a fabric made by knitting

knit (verb)	tie up (verb)
to gather something into small wrinkles or folds	secure with or as if with ropes
make (textiles) by knitting	finish the last row
tie or link together	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