sociology vs social science

sociology and social science both are nouns.

Word	Noun	Adjective	Verb	Adverb
sociology	Yes	No	No	No
social science	Yes	No	No	No

As nouns, social science is a hypernym of sociology; that is, social science is a word with a broader meaning than sociology:

sociology: the study and classification of human societies
social science: the branch of science that studies society and the relationships of individual within a society

sociology (noun)	social science (noun)
the study and classification of human societies	the branch of science that studies society and the relationships of individual within a society