bhang vs soft drug

bhang and soft drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
bhang	Yes	No	No	No
soft drug	Yes	No	No	No

As nouns, soft drug is a hypernym of bhang; that is, soft drug is a word with a broader meaning than bhang:

bhang: a preparation of the leaves and flowers of the hemp plant; much used in India
soft drug: a drug of abuse that is considered relatively mild and not likely to cause addiction

bhang (noun)	soft drug (noun)
a preparation of the leaves and flowers of the hemp plant; much used in India	a drug of abuse that is considered relatively mild and not likely to cause addiction