We don't have synonyms for immelmann yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are zimmermann, timmermann and immelmanns.
(n) :
(aviation) Ellipsis of Immelmann turn. [(military, aviation, archaic) A WWI-era fighter pilot maneuver resembling the aerobatic wingover or hammer-head turn, originally developed by Max Immelmann.]
(n) :
(aviation) Ellipsis of Immelmann turn. [(military, aviation, archaic) A WWI-era fighter pilot maneuver resembling the aerobatic wingover or hammer-head turn, originally developed by Max Immelmann.]