hugging vs foreplay

hugging and foreplay both are nouns.

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

As nouns, foreplay is a hypernym of hugging; that is, foreplay is a word with a broader meaning than hugging:

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

Other hypernyms of hugging include arousal, stimulation.

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