We don't have synonyms for intal yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are instal, intel and inial.
(n) :
An international auxiliary language created by German linguist Erich Weferling and published in 1956, developed as a compromise between Esperanto, Ido, Occidental-Interlingue, Neo and Novial.
(n) :
An international auxiliary language created by German linguist Erich Weferling and published in 1956, developed as a compromise between Esperanto, Ido, Occidental-Interlingue, Neo and Novial.