put-put vs petrol engine

put-put and petrol engine both are nouns.

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

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

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

Other hypernyms of put-put include gasoline engine.

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