We don't have synonyms for matchem yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are matched, matches and matchet.
(N) :
Matchem (1748 – 21 February 1781), sometimes styled as Match 'em, was a Thoroughbred racehorse who had a great influence on the breed, and was the earliest of three 18th century stallions that produced the Thoroughbred sire-lines of today, in addition to Eclipse and Herod.
(N) :
Matchem (1748 – 21 February 1781), sometimes styled as Match 'em, was a Thoroughbred racehorse who had a great influence on the breed, and was the earliest of three 18th century stallions that produced the Thoroughbred sire-lines of today, in addition to Eclipse and Herod.