show-off vs hot dog

show-off and hot dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
show-off	Yes	No	No	No
hot dog	Yes	No	No	No

As nouns, hot dog is a hyponym of show-off; that is, hot dog is a word with a more specific, narrower meaning than show-off:

show-off: someone who deliberately behaves in such a way as to attract attention
hot dog: someone who performs dangerous stunts to attract attention to himself

Other hyponyms of show-off include grandstander, hotdog, poser, poseur.

show-off (noun)	hot dog (noun)
someone who deliberately behaves in such a way as to attract attention	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