sharpener vs strop

sharpener and strop both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharpener	Yes	No	No	No
strop	Yes	No	Yes	No

As nouns, strop is a hyponym of sharpener; that is, strop is a word with a more specific, narrower meaning than sharpener:

sharpener: any implement that is used to make something (an edge or a point) sharper
strop: a leather strap used to sharpen razors

Other hyponyms of sharpener include grindstone, pencil sharpener, steel, strickle.

sharpener (noun)	strop (noun)
any implement that is used to make something (an edge or a point) sharper	a leather strap used to sharpen razors

sharpener (verb)	strop (verb)
	sharpen on a strop