| conjoined with(expression, adjective, subject, collateral, attendant) |
| coordinate(noun, adjective, associate, companion, subordinate) |
| coordinated |
| isochronous(adjective, accompanying, contributing, synchronism) |
| parallel(adjective, similar, subordinate, secondary, linked) |
| side effect(noun, expression, idiom, effect, adverse) |
| twin(noun, associate, companion, friend, contemporary) |
| escort(noun, guide, associate, friend, nurse) |
| adjuvant(adjective, subject, subordinate, collateral, additional) |
| affiliated(adjective, similar, attendant, related, linked) |
| agreeing(adjective, accompanying, contributing) |
| appurtenance(accessory, supplement) |
| co-occurrence |
| coeternal |
| complement(noun, guide, associate, companion, friend) |
| correlative(adjective, relational) |
| coterminous(adjective, subject, collateral, attendant, subsidiary) |
| incident(noun, adjective, similar, subordinate, contemporary) |
| incidental to(verb, expression, adjective, phrasal verb) |
| isochronal(adjective, accompanying, contributing) |