The word eerily is an adverb.
You can easily spot adverbs as they mostly end in the suffix -ly.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
The comparative of eerily is eerier and the superlative for eerily is eeriest
Eerily means in a strange, unearthly way.
The lights shone eerily on the wall as she walked into the room.
The young girl walked slowly into the eerily, dark and spooky forest.
Eerily.
The part of speech for this particular word is a noun.
part of speech
strangely
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.