Bursting could be several parts of speech, depending on how it is used in the sentence. It is known as a gerund, the present participle (-ing) form of a verb. A gerund can be used as a verb withing a clause, or as a noun, especially when used individually or as part of a non-finite clause in a sentence.
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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.