countertype

adversary analogue antagonist approximation companion competitor complement copy correlate double duplicate equivalent fellow like mate opponent parallel peer replica ringer rival twin

dead ringer lookalike spitting image

ally associate difference helper original supporter

clash imbalance mismatch

analogy comparison corollary resemblance similarity

analogue correlate correspondence correspondent counterpart double duplicate duplication equal equivalent kin likeness match parallelism twin

homologue

difference dissimilarity unlikeness

divergence opposite reverse