kit vs tool kit

kit and tool kit both are nouns.

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

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

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

kit (noun)	tool kit (noun)
young of any of various fur-bearing animals	a set of carpenter's tools
gear consisting of a set of articles or tools for a specified purpose
a case for containing a set of articles

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