tie down vs bind

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

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

As verbs, bind is a hypernym of tie down; that is, bind is a word with a broader meaning than tie down:

Other hypernyms of tie down include hold, obligate, oblige.

As verbs, tie down and bind are synonyms defined as:

Other synonyms of tie down include tie up, truss.

tie down (noun)	bind (noun)
	something that hinders as if with bonds

tie down (verb)	bind (verb)
restrain from independence by an obligation	cause to be constipated
secure with or as if with ropes	form a chemical bond with
	bind by an obligation; cause to be indebted
	make fast; tie or secure, with or as if with a rope
	fasten or secure with a rope, string, or cord
	provide with a binding
	stick to firmly
	secure with or as if with ropes
	wrap around with something so as to cover or enclose
	create social or emotional ties