tie down vs secure

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

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

tie down (adjective)	secure (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

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