Cardboard is a noun.
It depends on if there is ink in the cardboard.
Cardboard is made of lots of paper together. they are both made of fiber.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
No, cats do not typically eat cardboard. They may chew on it out of curiosity or to play, but it is not a part of their natural diet.
The part of speech for "unfamiliar" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.