Synonyms for the compound noun 'hot dog' are frank, frankfurter, or wiener.
There are also a number of other, regional terms for hot dog.
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In sentences such as "Don't touch the hot stove" or "That wire is hot to the touch" the word hot is the adjective. The word touch is a noun in either case - although in the second, it is the object of the adjective prepositional phrase.
dog
It is hoter
playful
As a prepositional phrase, it can be either, but more properly an adverb phrase. He studied the digestive process in dogs. (adjective, meaning of dogs) The disease is often found in dogs. (adverb)