Incarnations Of Godhead
Lord Caitanya explained to Sanatana Gosvami that the expansions of Lord Krsna who come to the material creation are called avataras. The word 'avatara' means 'one who descends' (from Sanskrit avatarati) and in this case the word specifically refers to one who descends from the spiritual sky.
Demigods And Controlling Deities
"These different demigods, or directors, such as Candra, Varuna and Vayu, are called adhikari-devata. The demigods are departmental heads. The government of the Supreme Lord consists not only of one planet or two or three; there are millions of planets and millions of universes."