scarf vs kerchief

scarf and kerchief both are nouns.

Word	Noun	Adjective	Verb	Adverb
scarf	Yes	No	Yes	No
kerchief	Yes	No	No	No

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

scarf: a garment worn around the head or neck or shoulders for warmth or decoration
kerchief: a square scarf that is folded into a triangle and worn over the head or about the neck

Other hyponyms of scarf include boa, feather boa, fichu, lambrequin, mantilla, muffler, patka, rebozo, sable, stole, tudung.

scarf (noun)	kerchief (noun)
a garment worn around the head or neck or shoulders for warmth or decoration	a square scarf that is folded into a triangle and worn over the head or about the neck
a joint made by notching the ends of two pieces of timber or metal so that they will lock together end-to-end

scarf (verb)	kerchief (verb)
wrap in or adorn with a scarf
masturbate while strangling oneself
unite by a scarf joint