frankfurter bun vs hot dog

frankfurter bun and hot dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
frankfurter bun	Yes	No	No	No
hot dog	Yes	No	No	No

frankfurter bun (noun)	hot dog (noun)
a long bun shaped to hold a frankfurter	a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll
	a frankfurter served hot on a bun
	someone who performs dangerous stunts to attract attention to himself