poppet vs poppet valve

poppet and poppet valve both are nouns.

Word	Noun	Adjective	Verb	Adverb
poppet	Yes	No	No	No
poppet valve	Yes	No	No	No

As nouns, poppet and poppet valve are synonyms defined as:

poppet and poppet valve: a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines

poppet (noun)	poppet valve (noun)
a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines	a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines