The Ural-Altaic linguistic hypothesis, now discredited, inspired the emergence of Turkish, Hungarian, Japanese and Korean branches of the Turanian Society in the 1920s and 1930s.

It may refer to various languages or linguistic hypotheses depending on the context:

Two linguistic hypotheses for the etymology of xian involve the Arabic language and Sino-Tibetan languages.

The origin and the meaning of the word Kolašin is still unknown although there is a whole range of linguistic hypotheses.

Basques arrived together with the Indo-Europeans: Linked to an unproven linguistic hypothesis that includes Basque and some Caucasian languages in a single super-family.

In the case of the non-Austronesian indigenous languages of Papua New Guinea and the indigneous languages of Australia, there is no published linguistic hypothesis supported by any evidence that these languages have links to any other families.

Recent mitochondrial DNA studies have supported this linguistic hypothesis.

The Extended Projection Principle (EPP) is a linguistic hypothesis about the obligatoriness of subjects.

In fact, this linguistic hypothesis was seriously called into question in the 1960s.