rescue vs salvage

rescue and salvage both are nouns.

Word	Noun	Adjective	Verb	Adverb
rescue	Yes	No	Yes	No
salvage	Yes	No	Yes	No

As nouns, salvage is a hyponym of rescue; that is, salvage is a word with a more specific, narrower meaning than rescue:

rescue: recovery or preservation from loss or danger
salvage: the act of rescuing a ship or its crew or its cargo from a shipwreck or a fire

As verbs, salvage is a hyponym of rescue; that is, salvage is a word with a more specific, narrower meaning than rescue:

Other hyponyms of rescue include relieve, salve, save, reprieve.

rescue (noun)	salvage (noun)
recovery or preservation from loss or danger	the act of rescuing a ship or its crew or its cargo from a shipwreck or a fire
	the act of saving goods or property that were in danger of damage or destruction
	property or goods saved from damage or destruction

rescue (verb)	salvage (verb)
take forcibly from legal custody	collect discarded material
free from harm or evil	save from ruin, destruction, or harm