hotdog vs chili dog

hotdog and chili dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
hotdog	Yes	No	No	No
chili dog	Yes	No	No	No

As nouns, chili dog is a hyponym of hotdog; that is, chili dog is a word with a more specific, narrower meaning than hotdog:

hotdog (noun)	chili dog (noun)
a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll	a hotdog with chili con carne on it
a frankfurter served hot on a bun
someone who performs dangerous stunts to attract attention to himself