Baal (/ˈbeɪəl, ˈbɑːəl/), properly Baʿal, was a title and honorific meaning "owner", "lord" in the Northwest Semitic languages spoken in the Levant during antiquity. From its use among people, it came to be applied to gods. Scholars previously associated the theonym with solar cults and with a variety of unrelated patron deities, but inscriptions have shown that the name Baʿal was particularly associated with the storm and fertility god Hadad and his local manifestations.
The Hebrew Bible, includes use of the term in reference to various Levantine deities, often with application towards Hadad, who was decried as a false god. That use was taken over into Christianity and Islam, sometimes under the opprobrious form Beelzebub in demonology.
Bel (/ˈbeɪl/; from Akkadian bēlu), signifying "Lord" or "Master", is a title rather than a genuine name, applied to various gods in the Mesopotamian religion of Akkad, Assyria and Babylonia. The feminine form is Belit 'Lady, Mistress'. Bel is represented in Greek as Belos and in Latin as Belus. Linguistically Bel is an East Semitic form cognate with Northwest Semitic Baal with the same meaning.
Early translators of Akkadian believed that the ideogram for the god called in Sumerian Enlil was to be read as Bel in Akkadian. Current scholarship holds this as incorrect, but one finds Bel used in referring to Enlil in older translations and discussions.
Bel became especially used for the Babylonian god Marduk and when found in Assyrian and neo-Babylonian personal names or mentioned in inscriptions in a Mesopotamian context it can usually be taken as referring to Marduk and no other god. Similarly Bêlit without some disambiguation mostly refers to Bel Marduk's spouse Sarpanit. However, Marduk's mother, the Sumerian goddess called Ninhursag, Damkina, Ninmah and other names in Sumerian, was often known as Belit-ili 'Lady of the Gods' in Akkadian.
Other gods called "Lord" could be and sometimes were identified totally or in part with Bel Marduk. The god Malak-bel of Palmyra is an example, though in the later period from which most of our information comes he seems to have become very much a sun god.
Similarly, Zeus Belus mentioned by Sanchuniathon as born to Cronus/El in Peraea is unlikely to be Marduk.
Bel of Palmyra, Syria
A god named Bel was the chief-god of Palmyra in pre-Hellenistic times, being worshipped alongside the gods Aglibol and Yarhibol. Originally, he was known as Bol, after the Northwestern Semitic word Ba'al (usually used to refer to the god Hadad), until the cult of Bel-Marduk spread to Palmyra and by 213 BC, Bol was renamed to Bel. The temple of Bel was dedicated to this god, which was destroyed by ISIS.