four-letter word vs four-letter Anglo-Saxon word

four-letter word and four-letter Anglo-Saxon word both are nouns.

Word	Noun	Adjective	Verb	Adverb
four-letter word	Yes	No	No	No
four-letter Anglo-Saxon word	Yes	No	No	No

As nouns, four-letter word and four-letter Anglo-Saxon word are synonyms defined as:

four-letter word and four-letter Anglo-Saxon word: any of several short English words (often having 4 letters) generally regarded as obscene or offensive

four-letter word (noun)	four-letter Anglo-Saxon word (noun)
any of several short English words (often having 4 letters) generally regarded as obscene or offensive	any of several short English words (often having 4 letters) generally regarded as obscene or offensive