seal vs piston ring

piston ring vs seal

seal and piston ring both are nouns.

seal is a verb but piston ring is not a verb.

Word	Noun	Adjective	Verb	Adverb
seal	Yes	No	Yes	No
piston ring	Yes	No	No	No

As nouns, piston ring is a hyponym of seal; that is, piston ring is a word with a more specific, narrower meaning than seal:

seal: fastener that provides a tight and perfect closure
piston ring: seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall

Other hyponyms of seal include break seal, gasket, washer.

seal (noun)	piston ring (noun)
any of numerous marine mammals that come on shore to breed; chiefly of cold regions	seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
a device incised to make an impression; used to secure a closing or to authenticate documents
fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters
fastener that provides a tight and perfect closure
a finishing coat applied to exclude moisture
an indication of approved or superior status
a stamp affixed to a document (as to attest to its authenticity or to seal it)
the pelt or fur (especially the underfur) of a seal

seal (verb)	piston ring (verb)
decide irrevocably
hunt seals
close with or as if with a seal
affix a seal to
make tight; secure against leakage
cover with varnish

Difference between seal and piston ring

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