imaginary being vs imaginary creature

imaginary being and imaginary creature both are nouns.

Word	Noun	Adjective	Verb	Adverb
imaginary being	Yes	No	No	No
imaginary creature	Yes	No	No	No

As nouns, imaginary being and imaginary creature are synonyms defined as:

imaginary being and imaginary creature: a creature of the imagination; a person that exists only in legends or myths or fiction

imaginary being (noun)	imaginary creature (noun)
a creature of the imagination; a person that exists only in legends or myths or fiction	a creature of the imagination; a person that exists only in legends or myths or fiction