We don't have synonyms for cosen yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are chosen, cozen and cosey.
(v) :
Alternative form of cozen (“deceive”). [(intransitive) To become cozy; (by extension) to become acquainted, comfortable, or familiar with.]
(n) :
(uncommon, scholarly) Alternative form of Joseon. [(historical) A former Korean kingdom and dynasty in East Asia which ruled the Korean Peninsula from 1392 CE to 1897 CE.]
(v) :
Alternative form of cozen (“deceive”). [(intransitive) To become cozy; (by extension) to become acquainted, comfortable, or familiar with.]
(n) :
(uncommon, scholarly) Alternative form of Joseon. [(historical) A former Korean kingdom and dynasty in East Asia which ruled the Korean Peninsula from 1392 CE to 1897 CE.]