The word treacherous is an adjective. It describes someone who exhibits treachery.
noun
Panic mongers and rumour-mongers
That man is treacherous
what part of speech is work
adverb
The treacherous ice is best to avoid The treacherous path through the woods had never been traveled before.
Panic mongers and rumour-mongers
The part of speech for "answer" is a noun.
That man is treacherous
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work
what part of speech is beneath
The part of speech for "indefinite" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "rapid" is an adjective.
The part of speech for "twirl" is a verb.