hotdog vs sandwich

hotdog and sandwich both are nouns.

Word	Noun	Adjective	Verb	Adverb
hotdog	Yes	No	No	No
sandwich	Yes	No	Yes	No

As nouns, sandwich is a hypernym of hotdog; that is, sandwich is a word with a broader meaning than hotdog:

hotdog (noun)	sandwich (noun)
a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll	two (or more) slices of bread with a filling between them
a frankfurter served hot on a bun
someone who performs dangerous stunts to attract attention to himself

hotdog (verb)	sandwich (verb)
	insert or squeeze tightly between two people or objects
	make into a sandwich