kit vs kit out

kit is a noun but kit out is not a noun.

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

As verbs, kit and kit out are synonyms defined as:

Other synonyms of kit include kit up.

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

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