The phrase "are element of" is a way of describing the parts that make up something bigger. Antonyms for this phrase might include "are not a part of," "are excluded from," or "do not contribute to." These antonyms suggest a separation or division, rather than a union or collaboration. Another possible antonym is "are opposed to," which implies a conflict or tension between the different elements. Ultimately, the antonyms for "are element of" depend on the context and the nature of the larger whole being described. They may convey a sense of distance, difference, or even hostility.