tie down vs fix

tie down is not a noun while fix is a noun.

Word	Noun	Adjective	Verb	Adverb
tie down	No	No	Yes	No
fix	Yes	No	Yes	No

tie down (noun)	fix (noun)
	the act of putting something in working order again
	an exemption granted after influence (e.g., money) is brought to bear
	a determination of the place where something is
	something craved, especially an intravenous injection of a narcotic drug
	informal terms for a difficult situation

tie down (verb)	fix (verb)
restrain from independence by an obligation	make infertile
secure with or as if with ropes	make fixed, stable or stationary
	restore by replacing a part or putting together what is torn or broken
	kill, preserve, and harden (tissue) in order to prepare for microscopic study
	make ready or suitable or equip in advance for a particular purpose or for some use, event, etc
	decide upon or fix definitely
	take vengeance on or get even
	cause to be firmly attached
	put (something somewhere) firmly
	prepare for eating by applying heat
	set or place definitely
	to be about to do something
	influence an event or its outcome by illegal means