psephology vs sociology

psephology and sociology both are nouns.

Word	Noun	Adjective	Verb	Adverb
psephology	Yes	No	No	No
sociology	Yes	No	No	No

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

psephology: the branch of sociology that studies election trends (as by opinion polls)
sociology: the study and classification of human societies

psephology (noun)	sociology (noun)
the branch of sociology that studies election trends (as by opinion polls)	the study and classification of human societies