两者表达的意思几乎相同，只不过attic除了阁楼还有一些其他的意思：

名词 garret:
floor consisting of open space at the top of a house just below roof; often used for storage

名词 attic:
1.floor consisting of open space at the top of a house just below roof; often used for storage

2.the dialect of Ancient Greek spoken and written in Attica and Athens

3.informal terms for a human head

4.(architecture) a low wall at the top of the entablature; hides the roof