This high-ranking choir comprised of 4, 5, 7 or 9 angels depending on what sources you read. The three commonly accepted Archangels are Michael, Gabriel and Raphael. The others are subject to debate; Uriel, Raguel, Zadkiel, Saraqael, Remiel, Anael, Orfiel, Uzziel, Raziel and Metatron. The Koran only recognized 4 and names two; Djibril (Gabriel) and Michael.
The Watchers were a specific race of divine beings known in Hebrew as 'nun resh ayin' or 'irin' meaning 'those who watch' or 'those who are awake', which is translated into Greek as Egrhgoroi egregoris or grigori, meaning 'watchers'.