paisa vs subunit

paisa and subunit both are nouns.

Word	Noun	Adjective	Verb	Adverb
paisa	Yes	No	No	No
subunit	Yes	No	No	No

As nouns, subunit is a hypernym of paisa; that is, subunit is a word with a broader meaning than paisa:

paisa: a fractional monetary unit in Bangladesh and India and Nepal and Pakistan
subunit: a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit

Other hypernyms of paisa include fractional monetary unit.

paisa (noun)	subunit (noun)
a fractional monetary unit in Bangladesh and India and Nepal and Pakistan	a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit