What part of speech is normal?

Answer 1

Normal can be an adjective or a noun.

As an adjective: It's quite normal for puppies to eat a lot.

As a verb: My temperature is above normal.

Answer 2

Normal is either a noun or an adjective, never a verb. In the example given ie. my temperature is above normal, the word normal provides more information about the noun temperature and is therefore an adjective.