snogging vs hugging

snogging and hugging both are nouns.

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

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

snogging: (British informal) cuddle and kiss
hugging: affectionate play (or foreplay without contact with the genital organs)

Other hypernyms of snogging include caressing, cuddling, fondling, kissing, necking, petting, smooching, snuggling.

snogging (noun)	hugging (noun)
(British informal) cuddle and kiss	affectionate play (or foreplay without contact with the genital organs)