intensive vs in truth

intensive is a noun but in truth is not a noun.

Word	Noun	Adjective	Verb	Adverb
intensive	Yes	Yes	No	No
in truth	No	No	No	Yes

intensive (noun)	in truth (noun)
a modifier that has little meaning except to intensify the meaning it modifies

intensive (adjective)	in truth (adjective)
of agriculture; intended to increase productivity of a fixed area by expending more capital and labor
tending to give force or emphasis
characterized by a high degree or intensity; often used as a combining form

intensive (adverb)	in truth (adverb)
	in fact (used as intensifiers or sentence modifiers)