fractional monetary unit vs subunit

fractional monetary unit and subunit both are nouns.

Word	Noun	Adjective	Verb	Adverb
fractional monetary unit	Yes	No	No	No
subunit	Yes	No	No	No

As nouns, fractional monetary unit and subunit are synonyms defined as:

fractional monetary unit and subunit: a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit

fractional monetary unit (noun)	subunit (noun)
a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit	a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit