Question

1. Dancing is fun.

(Is 'fun' and adverb or a noun?

Answer 1

In this sentence, it's an adjective, modifying "Dancing."

http://dictionary.reference.com/browse/fun

Answer 2

fun   /fʌn/ Show Spelled
[fuhn] Show IPA
noun, verb, funned, fun·ning, adjective
–noun
1. something that provides mirth or amusement: A picnic would be fun.
2. enjoyment or playfulness: She's full of fun.
–verb (used without object), verb (used with object)
3. Informal . joke; kid.
–adjective
4. Informal . of or pertaining to fun, especially to social fun: a fun thing to do; really a fun person.
5. Informal . whimsical; flamboyant: The fashions this year are definitely on the fun side.

(Thank you. According to the dictionary, it seems to be an adjective. Right? Or can 'fun' be an adjective and a noun?)