Gemini the Twins vs Gemini

Gemini the Twins and Gemini both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gemini the Twins	Yes	No	No	No
Gemini	Yes	No	No	No

As nouns, Gemini the Twins and Gemini are synonyms defined as:

Gemini the Twins and Gemini: the third sign of the zodiac; the sun is in this sign from about May 21 to June 20

Other synonyms of Gemini the Twins include Twins.

Gemini the Twins (noun)	Gemini (noun)
the third sign of the zodiac; the sun is in this sign from about May 21 to June 20	the third sign of the zodiac; the sun is in this sign from about May 21 to June 20
	a zodiacal constellation in the Northern Hemisphere between Taurus and Cancer on the ecliptic
	(astrology) a person who is born while the sun is in Gemini