milliliter vs millilitre

milliliter and millilitre both are nouns.

Word	Noun	Adjective	Verb	Adverb
milliliter	Yes	No	No	No
millilitre	Yes	No	No	No

As nouns, milliliter and millilitre are synonyms defined as:

milliliter and millilitre: a metric unit of volume equal to one thousandth of a liter

Other synonyms of milliliter include cc, cubic centimeter, cubic centimetre, mil, ml.

milliliter (noun)	millilitre (noun)
a metric unit of volume equal to one thousandth of a liter	a metric unit of volume equal to one thousandth of a liter