Semitic languages
The similarity of the Hebrew, Arabic and Aramaic languages was accepted by Jewish and Islamic scholars since medieval times. The languages were familiar to Western European scholars due to historical contact with neighbouring Near Eastern countries and through Biblical studies, and a comparative analysis of Hebrew, Arabic, and Aramaic was published in Latin in 1538 by Guillaume Postel. Almost two centuries later, Hiob Ludolf described the similarities between these three languages and the Ethiopian Semitic languages. However, neither scholar named this grouping as "Semitic".
Judeo-Yemeni Arabic
Judeo-Yemeni Arabic (also known as Judeo-Yemeni and Yemenite Judeo-Arabic) is a variety of Arabic spoken by Jews living or formerly living in Yemen. The language is quite different from mainstream Yemeni Arabic, and is written in the Hebrew alphabet. The cities of Sana'a, Aden, al-Bayda, and Habban District and the villages in their districts each have (or had) their own dialect.