As-salāmu ʿalaikum wa rahmatullah,

Sorry for the late reply, hope you are doing well.

the word أَخْفَى is used here as an accusative noun derived from the verb خَفَى. Therefore, it has been identified as a noun. However, its various forms as a verb and noun have been detailed in the explanation (click more).

For more details, please see:

JazakAllahu khairan for reaching out to us.