chili dog vs hotdog

chili dog and hotdog both are nouns.

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

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

Other hypernyms of chili dog include hot dog, red hot.

chili dog (noun)	hotdog (noun)
a hotdog with chili con carne on it	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