private vs insular

private is a noun but insular is not a noun.

Word	Noun	Adjective	Verb	Adverb
private	Yes	Yes	No	No
insular	No	Yes	No	No

private (noun)	insular (noun)
an enlisted man of the lowest rank in the Army or Marines

private (adjective)	insular (adjective)
confined to particular persons or groups or providing privacy	relating to or characteristic of or situated on an island
not expressed	suggestive of the isolated life of an island
concerning one person exclusively	narrowly restricted in outlook or scope
concerning things deeply private and personal