put down vs unload

put down and unload both are verbs.

Word	Noun	Adjective	Verb	Adverb
put down	No	No	Yes	No
unload	No	No	Yes	No

As verbs, put down and unload are synonyms defined as:

Other synonyms of put down include discharge, drop, drop off, set down.

put down (verb)	unload (verb)
put down in writing; of texts, musical compositions, etc.	remove the load from (a container or vehicle)
make a record of; set down in permanent form	remove (cargo, people, etc.) from and leave
put in a horizontal position
remove (cargo, people, etc.) from and leave
cause to sit or seat or be in a settled position or place
put (an animal) to death
reduce in worth or character, usually verbally
cause to come to the ground