We don't have synonyms for black ties yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are black-tie, black tie and black tea.
(n) :
(uncountable) Evening dress; a standard of dress which is less formal than white tie, consisting of black dinner jacket or tuxedo jacket, and matching trousers, white shirt and black bow tie or, possibly, military dress or national costume.
(n) :
(countable) A black bow tie worn with a dinner jacket.
(n) :
Used other than figuratively or idiomatically: see black, tie.
(n) :
(uncountable) Evening dress; a standard of dress which is less formal than white tie, consisting of black dinner jacket or tuxedo jacket, and matching trousers, white shirt and black bow tie or, possibly, military dress or national costume.
(n) :
(countable) A black bow tie worn with a dinner jacket.
(n) :
Used other than figuratively or idiomatically: see black, tie.