Cybele vs Great Mother

Cybele and Great Mother both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cybele	Yes	No	No	No
Great Mother	Yes	No	No	No

As nouns, Cybele and Great Mother are synonyms defined as:

Cybele and Great Mother: great nature goddess of ancient Phrygia in Asia Minor; counterpart of Greek Rhea and Roman Ops

Other synonyms of Cybele include Dindymene, Magna Mater, Mater Turrita.

Cybele (noun)	Great Mother (noun)
great nature goddess of ancient Phrygia in Asia Minor; counterpart of Greek Rhea and Roman Ops	great nature goddess of ancient Phrygia in Asia Minor; counterpart of Greek Rhea and Roman Ops