The word "PHYS REV D PART FIELDS" is a scientific term referring to a specific journal dedicated to the study of particle physics and related fields. Antonyms for this term would be words that are unrelated to science or physics, such as "art," "literature," or "music." Alternatively, antonyms could also include scientific terms related to completely different fields, such as "botany," "oceanography," or "psychology." It's important to note, however, that antonyms for a specific term are not always clear-cut, as they can vary depending on context and nuance.