American pit bull terrier vs pit bull terrier

American pit bull terrier and pit bull terrier both are nouns.

Word	Noun	Adjective	Verb	Adverb
American pit bull terrier	Yes	No	No	No
pit bull terrier	Yes	No	No	No

As nouns, American pit bull terrier and pit bull terrier are synonyms defined as:

American pit bull terrier and pit bull terrier: American breed of muscular terriers with a short close-lying stiff coat

Other synonyms of American pit bull terrier include American Staffordshire terrier, Staffordshire terrier.

American pit bull terrier (noun)	pit bull terrier (noun)
American breed of muscular terriers with a short close-lying stiff coat	American breed of muscular terriers with a short close-lying stiff coat