knife vs letter opener

letter opener vs knife

knife and letter opener both are nouns.

knife is a verb but letter opener is not a verb.

Word	Noun	Adjective	Verb	Adverb
knife	Yes	No	Yes	No
letter opener	Yes	No	No	No

As nouns, letter opener is a hyponym of knife; that is, letter opener is a word with a more specific, narrower meaning than knife:

knife: edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
letter opener: dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books

Other hyponyms of knife include barong, bolo, bolo knife, Bowie knife, bread knife, butcher knife, carving knife, case knife, sheath knife, drawknife, drawshave, hunting knife, paper knife, paperknife, linoleum cutter, linoleum knife, parang, parer, paring knife, pocket knife, pocketknife, pruning knife, slicer, surgical knife, table knife, gardening knife, chopper knife, chopping knife.

knife (noun)	letter opener (noun)
edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle	dull knife used to cut open the envelopes in which letters are mailed or to slit uncut pages of books
a weapon with a handle and blade with a sharp point
any long thin projection that is transient

knife (verb)	letter opener (verb)
use a knife on

Difference between knife and letter opener

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