hood of the cape (?), top of the cape (?) (partially a loanword from Spanish)
Alonso de Molina:
capa tzontecomatl. capilla de capa. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 12v. col. 1. Thanks to Joe Campbell for providing the transcription.