Deities is the plural form of the noun deity.
The word 'dieties' is not in the dictionaryThe word deity and the plural form deities are the correct spellings.The word 'deities' is a noun, a plural noun, a word for gods and/or goddesses; a word for people (real or fictional).
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.