upper vs chalk

upper and chalk both are nouns.

upper is an adjective but chalk is not an adjective.

upper is not a verb while chalk is a verb.

Word	Noun	Adjective	Verb	Adverb
upper	Yes	Yes	No	No
chalk	Yes	No	Yes	No

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

upper: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
chalk: an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant

Other hyponyms of upper include amphetamine sulfate, amphetamine sulphate, bennie, Benzedrine, Dexedrine, dextroamphetamine sulphate, chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash.

upper (noun)	chalk (noun)
piece of leather or synthetic material that forms the part of a shoe or boot above the sole that encases the foot	a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
the higher of two berths	a pure flat white with little reflectance
	a soft whitish calcite

upper (adjective)	chalk (adjective)
the topmost one of two; upper
higher in place or position
superior in rank or accomplishment

upper (verb)	chalk (verb)
	write, draw, or trace with chalk

Difference between upper and chalk

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