secure vs tie down

secure is an adjective but tie down is not an adjective.

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

secure (adjective)	tie down (adjective)
free from fear or doubt; easy in mind
free from danger or risk
not likely to fail or give way
immune to attack; incapable of being tampered with
financially safe

secure (verb)	tie down (verb)
make certain of	restrain from independence by an obligation
cause to be firmly attached	secure with or as if with ropes
fill or close tightly with or as if with a plug
furnish with battens
get by special effort
assure payment of