identical twin vs monozygotic twin

identical twin and monozygotic twin both are nouns.

Word	Noun	Adjective	Verb	Adverb
identical twin	Yes	No	No	No
monozygotic twin	Yes	No	No	No

As nouns, identical twin and monozygotic twin are synonyms defined as:

identical twin and monozygotic twin: either of two twins developed from the same fertilized ovum (having the same genetic material)

Other synonyms of identical twin include monozygous twin.

identical twin (noun)	monozygotic twin (noun)
either of two twins developed from the same fertilized ovum (having the same genetic material)	either of two twins developed from the same fertilized ovum (having the same genetic material)