Relatively few linguistic materials of Hup are available, due to the isolation of the Hupda. Incomplete vocabulary lists and dictionaries were established in 1955 (Giacone) and 1993 (Erickson and Erickson). The most complete descriptive grammar of Hup,
A Grammar of Hup, was written by Patience Epps in 2005, was updated in 2008, and outlines Hup phonology, parts of speech, morphology, aspect, tense, modality, among many other features. Hup is one of four languages in the Naduhup (Makú) family. Though
Makú is the term most commonly used to refer to this language family, there is controversy over its usage, since it is also an ethnic slur, translating to “without language”, used by the Tukanoan towards the Naduhup. There has not been a consensus on a replacement term, although Epps proposed “Naduhup”, which combines the names of the four members of the language family -
Nadëb,
Dâw, Hup, and
Yuhup. Of the four members of the language family, Hup is most closely related to Yuhup, followed by Dâw, and then lastly by Nadëb. Hup and Yuhup are nearly mutually intelligible, sharing more than 90% of their basic vocabularies. == Phonology ==