Noun:
* "They bought government bonds." (A certificate of debt issued by a government or corporation)
* "There was a strong bond between the two friends." (A connection, tie, or relationship)
Verb:
* "They bonded over their shared love of music." (To form a connection or relationship)
* "The workers bonded the pieces of metal together." (To join or unite)
Adjective:
* "The bond between parent and child is unbreakable." (Strong, close, or intimate)
Therefore, the part of speech for "bond" depends on the context of the sentence.