The word rebuilding is a verb. It is the present participle of the verb rebuild.
adverb
what part of speech is work
i want to know what part of speech is camping
what part of speech is beneath
what part of speech is eleven
Writing a source code is the first part of the rebuilding a program.
peacemaking and rebuilding the Union.
part of speech
The part of speech for this particular word is a noun.
what part of speech is beneath
adverb
what part of speech is work
the part of speech sashay is a averb
The word speech is a noun.
Adjective
No, but it's part of a noun which the noun is the part of speech.
Yes, conjunction is a part of speech.