physiography vs geography

physiography and geography both are nouns.

Word	Noun	Adjective	Verb	Adverb
physiography	Yes	No	No	No
geography	Yes	No	No	No

As nouns, geography is a hypernym of physiography; that is, geography is a word with a broader meaning than physiography:

physiography: the study of physical features of the earth's surface
geography: study of the earth's surface; includes people's responses to topography and climate and soil and vegetation

Other hypernyms of physiography include geographics.

physiography (noun)	geography (noun)
the study of physical features of the earth's surface	study of the earth's surface; includes people's responses to topography and climate and soil and vegetation