Imperial capacity unit vs British capacity unit

Imperial capacity unit and British capacity unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
Imperial capacity unit	Yes	No	No	No
British capacity unit	Yes	No	No	No

As nouns, Imperial capacity unit and British capacity unit are synonyms defined as:

Imperial capacity unit and British capacity unit: a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet

Imperial capacity unit (noun)	British capacity unit (noun)
a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet	a unit of measure for capacity officially adopted in the British Imperial System; British units are both dry and wet