fix vs tie down

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

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

fix (noun)	tie down (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

fix (verb)	tie down (verb)
make infertile	restrain from independence by an obligation
make fixed, stable or stationary	secure with or as if with ropes
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