monozygous twin vs identical twin

monozygous twin and identical twin both are nouns.

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

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

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

Other synonyms of monozygous twin include monozygotic twin.

monozygous 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)