physical geography vs geography

physical geography and geography both are nouns.

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

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

physical geography: 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 physical geography include geographics.

physical geography (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