home truth vs truth

home truth and truth both are nouns.

Word	Noun	Adjective	Verb	Adverb
home truth	Yes	No	No	No
truth	Yes	No	No	No

As nouns, truth is a hypernym of home truth; that is, truth is a word with a broader meaning than home truth:

home truth: an important truth that is unpleasant to acknowledge (as about yourself)
truth: a fact that has been verified

home truth (noun)	truth (noun)
an important truth that is unpleasant to acknowledge (as about yourself)	the quality of being near to the true value
	a fact that has been verified
	a true statement
	conformity to reality or actuality