sex activity vs excitation

sex activity and excitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex activity	Yes	No	No	No
excitation	Yes	No	No	No

sex activity (noun)	excitation (noun)
activities associated with sexual intercourse	something that agitates and arouses
	the neural or electrical arousal of an organ or muscle or gland
	the state of being emotionally aroused and worked up