coco.

Headword: 
coco.
Principal English Translation: 

a female domestic servant (see Molina)

IPAspelling: 
koko
Alonso de Molina: 

coco. criada de casa o siruienta.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 23v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

This is an example of a suffixless noun (no -tl, -tli, or -in ending).
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 232.