bind vs tie down

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

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

As verbs, tie down is a hyponym of bind; that is, tie down is a word with a more specific, narrower meaning than bind:

Other hyponyms of bind include pledge, article, indent, indenture.

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

Other synonyms of bind include tie up, truss.

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

bind (verb)	tie down (verb)
cause to be constipated	restrain from independence by an obligation
form a chemical bond with	secure with or as if with ropes
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