arousal vs hugging

arousal and hugging both are nouns.

Word	Noun	Adjective	Verb	Adverb
arousal	Yes	No	No	No
hugging	Yes	No	No	No

As nouns, hugging is a hyponym of arousal; that is, hugging is a word with a more specific, narrower meaning than arousal:

arousal: mutual sexual fondling prior to sexual intercourse
hugging: affectionate play (or foreplay without contact with the genital organs)

Other hyponyms of arousal include caressing, cuddling, fondling, kissing, necking, petting, smooching, snuggling, feel.

arousal (noun)	hugging (noun)
the act of arousing	affectionate play (or foreplay without contact with the genital organs)
mutual sexual fondling prior to sexual intercourse
awakening from sleep
a state of heightened physiological activity