Hebrew אב, “father.” The masculine sexual power of the Holy Spirit, the sephirah Binah (“understanding”), accompanied by Aima, the feminine sexual power of Binah.
Abel
Abel הבל – vanity.
“These are the words of the Preacher, the son of David, king in Jerusalem.”
“Vanity of vanities, says the Preacher, vanity of vanities; all is vanity. “
Abinu
Abinu אָבִינוּ – Father (from the Our Father).
Ad
Ad אד Mist or vapor