kit vs sewing kit

kit and sewing kit both are nouns.

Word	Noun	Adjective	Verb	Adverb
kit	Yes	No	Yes	No
sewing kit	Yes	No	No	No

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

Other hyponyms of kit include carpenter's kit, tool kit, first-aid kit, layette, mess kit.

kit (noun)	sewing kit (noun)
young of any of various fur-bearing animals	a kit of articles used in sewing
gear consisting of a set of articles or tools for a specified purpose
a case for containing a set of articles

kit (verb)	sewing kit (verb)
supply with a set of articles or tools