current unit vs mA

current unit and mA both are nouns.

Word	Noun	Adjective	Verb	Adverb
current unit	Yes	No	No	No
mA	Yes	No	No	No

As nouns, mA is a hyponym of current unit; that is, mA is a word with a more specific, narrower meaning than current unit:

current unit: a measure of the amount of electric charge flowing past a circuit point at a specific time
mA: one thousandth of an ampere

Other hyponyms of current unit include A, amp, ampere, milliampere, abamp, abampere, ampere, international ampere.

current unit (noun)	mA (noun)
a measure of the amount of electric charge flowing past a circuit point at a specific time	one thousandth of an ampere