displacement unit vs cubic content unit

displacement unit and cubic content unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
displacement unit	Yes	No	No	No
cubic content unit	Yes	No	No	No

As nouns, displacement unit and cubic content unit are synonyms defined as:

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

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

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