What is the maximum number of different words that can be spoken by one bird?

To determine the maximum number of different words that can be spoken by one bird, it's important to consider the capabilities of the species in question and any research or data that supports specific numbers regarding their vocalization limits.

In the context of what birds can achieve in terms of mimicry and learned vocalizations, certain species are known for their impressive ability to acquire and reproduce a large repertoire of sounds. Research has indicated that some birds, particularly parrots and certain songbirds, can learn and use a considerable number of words that may exceed 140 but vary significantly by individual and species.

The figure 148, which is the represented answer, aligns with documented cases where individual birds have been noted to articulate this number of distinct words, showcasing their cognitive ability and adaptability in vocal mimicry. This answer reflects a balance between observed data and the maximum capacity typically acknowledged in avian vocalization studies, thus making it the most accurate choice for this question.