Oxford English vs UK English

Oxford English and UK English both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oxford English	Yes	No	No	No
UK English	Yes	No	No	No

As nouns, UK English is a hypernym of Oxford English; that is, UK English is a word with a broader meaning than Oxford English:

Oxford English: the dialect of English spoken at Oxford University and regarded by many as affected and pretentious
UK English: English as spoken in the UK

Other hypernyms of Oxford English include British English.

Oxford English (noun)	UK English (noun)
the dialect of English spoken at Oxford University and regarded by many as affected and pretentious	English as spoken in the UK