physiognomy vs human face

physiognomy and human face both are nouns.

Word	Noun	Adjective	Verb	Adverb
physiognomy	Yes	No	No	No
human face	Yes	No	No	No

As nouns, human face is a hypernym of physiognomy; that is, human face is a word with a broader meaning than physiognomy:

physiognomy: the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
human face: the front of the human head from the forehead to the chin and ear to ear

Other hypernyms of physiognomy include face.

physiognomy (noun)	human face (noun)
the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)	the front of the human head from the forehead to the chin and ear to ear