Britishism vs Anglicism

Britishism and Anglicism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Britishism	Yes	No	No	No
Anglicism	Yes	No	No	No

As nouns, Britishism and Anglicism are synonyms defined as:

Britishism and Anglicism: a custom that is peculiar to England or its citizens

As nouns, Britishism and Anglicism are synonyms defined as:

Britishism and Anglicism: an expression that is used in Great Britain (especially as contrasted with American English)

Other synonyms of Britishism include Briticism.

Britishism (noun)	Anglicism (noun)
a custom that is peculiar to England or its citizens	a custom that is peculiar to England or its citizens
an expression that is used in Great Britain (especially as contrasted with American English)	an expression that is used in Great Britain (especially as contrasted with American English)