How to Say "identical twin" in Spanish
The Spanish word for “identical twin” is “gemela” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
nounA1
specifically someone who looks exactly like their sister

Examples
Tengo una hermana gemela y mucha gente nos confunde.
I have a twin sister and many people confuse us.
Ella es la gemela de María.
She is Maria's twin.
Using the feminine form
Since this word ends in 'a', it refers specifically to a female twin. If you are talking about a male twin, you would use 'gemelo'.
Gemela vs. Melliza
Mistake: “Using 'gemela' for any twin.”
Correction: In many regions, 'gemela' specifically means identical twins who share the same DNA, while 'melliza' is used for fraternal twins (those who don't look exactly alike).
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