poppet valve vs poppet

poppet valve and poppet both are nouns.

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

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

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

poppet valve (noun)	poppet (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