The word rebuilding is a verb. It is the present participle of the verb rebuild.
adverb
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
Oppose is a verb.
Writing a source code is the first part of the rebuilding a program.
part of speech
The part of speech for this particular word is a noun.
peacemaking and rebuilding the Union.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "lecturer" is a noun.