We don't have synonyms for mercat yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are merca, meercat and mercast.
(n) :
Obsolete form of meerkat. [Suricata suricatta, a small carnivorous mammal of the mongoose family, from the Kalahari Desert, known for its habit of standing on its hind legs.]
(n) :
Obsolete form of meerkat. [Suricata suricatta, a small carnivorous mammal of the mongoose family, from the Kalahari Desert, known for its habit of standing on its hind legs.]