adjective
heavy
heavy
The word "so" is an adverb in that sentence. It's modifying the adjective "heavy".
It is a noun.
Thick can be an adjective, a noun and an adverb. Adjective: e.g. heavy in build. Noun: The thickest part of something. Adverb: In a thick manner.
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
Metaphor
what part of speech is beneath
adverb
what part of speech is work