We don't have synonyms for ethynes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ethyne and ethenes.
(n) :
(organic chemistry, official IUPAC name) The organic compound acetylene. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula HC≡CH or C₂H₂.
(n) :
(organic chemistry, official IUPAC name) The organic compound acetylene. The simplest alkyne, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula HC≡CH or C₂H₂.