Shalom,
Hebrew is a late Canaanite dialect; among the earliest of the Canaanite dialects is Ugaritic. Ugaritic has many consonants which do not appear in Hebrew, but does appear in Akkadian and Arabic. Aramaic, a Northwest Semitic language, demonstrates alternate pronunciations in cognates which could indicate possible alternate consonants which were subsequently dropped from the Hebrew dialect. There are words such as דבח (Aramaic) v/s זבח (Hebrew); תבר (Aramaic) v/s שבר (Hebrew) etc.
I find it very interesting that Ugaritic resembles the Akkadian (the earliest recorded Semitic language) and Arabic in conjugation and case endings more closely than it resembles the conjugation of Hebrew and Aramaic (neither of which utilizes case endings). The Ugaritic, like Arabic, has only three vowels (a, i, and u). Both Hebrew and Aramaic have similar vowels with a broader range of vocalization. Among Hebrew and Aramaic vowels is the seghol, an e vowel. Interesting enough, the e vowel also appears in Akkadian; Akkadian had the a, i, e, and u vowels. The conjugation of Ugaritic resmebles Arabic almost exactly: QTL- QaTaLa- YaQTuLu.
I am including some pictures of the Ugaritic consonants compared to the Hebrew, Arabic, Aramaic, and Akkadian languages.
Yaaqov ben Yisrael