put-put vs gasoline engine

put-put and gasoline engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
put-put	Yes	No	No	No
gasoline engine	Yes	No	No	No

As nouns, gasoline engine is a hypernym of put-put; that is, gasoline engine is a word with a broader meaning than put-put:

put-put: a small gasoline engine (as on motor boat)
gasoline engine: an internal-combustion engine that burns gasoline; most automobiles are driven by gasoline engines

Other hypernyms of put-put include petrol engine.

put-put (noun)	gasoline engine (noun)
a small gasoline engine (as on motor boat)	an internal-combustion engine that burns gasoline; most automobiles are driven by gasoline engines