kit vs carpenter's kit

kit and carpenter's kit both are nouns.

Word	Noun	Adjective	Verb	Adverb
kit	Yes	No	Yes	No
carpenter's kit	Yes	No	No	No

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

Other hyponyms of kit include tool kit, first-aid kit, layette, mess kit, sewing kit.

kit (noun)	carpenter's 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)	carpenter's kit (verb)
supply with a set of articles or tools