monozygotic twin vs identical twin

monozygotic twin and identical twin both are nouns.

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

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

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

Other synonyms of monozygotic twin include monozygous twin.

monozygotic twin (noun)	identical 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)