displacement unit vs capacity unit

displacement unit and capacity unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
displacement unit	Yes	No	No	No
capacity unit	Yes	No	No	No

As nouns, displacement unit and capacity unit are synonyms defined as:

displacement unit and capacity unit: a unit of measurement of volume or capacity

Other synonyms of displacement unit include capacity measure, cubage unit, cubature unit, cubic content unit, cubic measure, volume unit.

displacement unit (noun)	capacity unit (noun)
a unit of measurement of volume or capacity	a unit of measurement of volume or capacity