We don't have synonyms for copulations yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are population, copulation and populations.
(n) :
(uncountable) Sexual procreation between a man and a woman or transfer of the sperm from male to female; usually applied to the mating process in nonhuman animals; coitus; coition.
(n) :
(countable) The act of coupling or joining; union; conjunction.
(n) :
(uncountable) Sexual procreation between a man and a woman or transfer of the sperm from male to female; usually applied to the mating process in nonhuman animals; coitus; coition.
(n) :
(countable) The act of coupling or joining; union; conjunction.