Adjective
The word "gigantic" is an adjective, describing something really, really large. But not every adjective can become a noun. Gigantic does not have a noun form.
Gigantic - 2010 Pilot Part 2 1-2 was released on: USA: 8 October 2010
because it's butt is gigantic
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
Gigantic - 2010 Pilot Part 1 1-1 was released on: USA: 8 October 2010 Germany: 12 September 2011
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.