thin out vs dilute

thin out is not an adjective while dilute is an adjective.

Word	Noun	Adjective	Verb	Adverb
thin out	No	No	Yes	No
dilute	No	Yes	Yes	No

As verbs, thin out and dilute are synonyms defined as:

thin out and dilute: lessen the strength or flavor of a solution or mixture

Other synonyms of thin out include cut, reduce, thin.

thin out (adjective)	dilute (adjective)
	reduced in strength or concentration or quality or purity

thin out (verb)	dilute (verb)
make sparse	lessen the strength or flavor of a solution or mixture
become sparser	corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
lessen the strength or flavor of a solution or mixture