Stealthily is an adverb. The ending "-ly" gives a strong indication of its part of speech.
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 word "stealthily" is an adverb. It describes how an action is performed, in a secretive or cautious manner.
"Ghost" can be both a noun and a verb. As a noun, it refers to the spirit of a dead person. As a verb, it means to move silently and stealthily.
I entered the room stealthily, hoping to remain unnoticed.
He stealthily snuck into the clock tower known as Big Ben
stealthily
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
The sniper crept stealthily through the bushes, trying to remain unnoticed.
The part of speech for "explicit" is an adjective.