horny vs aroused

horny and aroused both are adjectives.

Word	Noun	Adjective	Verb	Adverb
horny	No	Yes	No	No
aroused	No	Yes	No	No

As adjectives, horny and aroused are synonyms defined as:

Other synonyms of horny include randy, ruttish, steamy, turned on.

horny (adjective)	aroused (adjective)
made of horn (or of a substance resembling horn)	(of persons) excessively affected by emotion
having horns or hornlike projections	aroused to action
feeling great sexual desire	emotionally aroused
	keenly excited (especially sexually) or indicating excitement
	feeling great sexual desire
	brought to a state of great tension