social vs societal

social is a noun but societal is not a noun.

Word	Noun	Adjective	Verb	Adverb
social	Yes	Yes	No	No
societal	No	Yes	No	No

As adjectives, social and societal are synonyms defined as:

social (noun)	societal (noun)
a party of people assembled to promote sociability and communal activity

social (adjective)	societal (adjective)
living together or enjoying life in communities or organized groups	relating to human society and its members
relating to human society and its members
relating to or belonging to or characteristic of high society
marked by friendly companionship with others
tending to move or live together in groups or colonies of the same kind
composed of sociable people or formed for the purpose of sociability