It's a noun.
how high are the walls at the 2014 halfpipe
Shaun White of the United States won the gold medal in men's halfpipe. Ayumu Hirano of Japan won the silver medal in men's halfpipe. Scott James of Australia won the bronze medal in men's halfpipe.
Chloe Kim of the United States won the gold medal in women's halfpipe. Liu Jiayu of China won the silver medal in women's halfpipe. Arielle Gold of the United States won the bronze medal in women's halfpipe.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
Yes.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.