Co-occurs means to happen together or at the same time. Its antonym is disassociate, which means to disconnect or separate. Another antonym for co-occurs is contrast, suggesting a clear distinction between two different things. Co-occurs can also be antonymous to non-coincide, which specifies that two events do not happen at the same time or together. Disunite, disjoin, and detach are other antonyms for co-occurs, indicating that two events or entities are not connected or related. Ultimately, co-occurs may be used interchangeably with a variety of different antonyms, depending on the context and specific meaning of the text or sentence.