Anglicism vs Britishism

Anglicism and Britishism both are nouns.

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

As nouns, Anglicism and Britishism are synonyms defined as:

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

As nouns, Anglicism and Britishism are synonyms defined as:

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

Other synonyms of Anglicism include Briticism.

Anglicism (noun)	Britishism (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)