Hello,umi酱!
词汇区别最好看英文释义。两者都皆可做名词和动词。
做名词时
2. salvage
(1)the act of saving things that have been, or are likely to be, damaged or lost, especially in a disaster or an accident (对财物等的)抢救
(2)the things that are saved from a disaster or an accident 抢救出的财物
做动词时
guaziqiaqia
rescue 英 /ˈreskjuː/谐音“2四克油”是指营救,援救“人员”
n. 营救,解救,援救;营救行动v. 营救,援救;(非正式)防止……丢失
Then they all came to his rescue; 这时他们都来救援他。
salvage 英 /ˈsælvɪdʒ/谐音“塞尔位置”是指打捞;抢救“财货”
二者不可以互换