compound vs sharpen

compound is a noun but sharpen is not a noun.

Word	Noun	Adjective	Verb	Adverb
compound	Yes	Yes	Yes	No
sharpen	No	No	Yes	No

As verbs, sharpen is a hyponym of compound; that is, sharpen is a word with a more specific, narrower meaning than compound:

Other hyponyms of compound include heat up, hot up, screw up, fan, enhance, heighten, raise, amplify, heighten.

compound (noun)	sharpen (noun)
an enclosure of residences and other building (especially in the Orient)
a whole formed by a union of two or more elements or parts
a word (as anthropology, kilocycle, builder) consisting of any of various combinations of words, combining forms, or affixes.
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight

compound (adjective)	sharpen (adjective)
composed of more than one part
consisting of two or more substances or ingredients or elements or parts
composed of many distinct individuals united to form a whole or colony

compound (verb)	sharpen (verb)
put or add together	become sharp or sharper
make more intense, stronger, or more marked	make crisp or more crisp and precise
combine so as to form a whole; mix	raise the pitch of (musical notes)
create by mixing or combining	put (an image) into focus
calculate principal and interest	make (one's senses) more acute
	give a point to
	make sharp or sharper
	make (images or sounds) sharp or sharper