human foot vs pes

human foot and pes both are nouns.

Word	Noun	Adjective	Verb	Adverb
human foot	Yes	No	No	No
pes	Yes	No	No	No

As nouns, human foot and pes are synonyms defined as:

human foot and pes: the part of the leg of a human being below the ankle joint

Other synonyms of human foot include foot.

human foot (noun)	pes (noun)
the part of the leg of a human being below the ankle joint	the part of the leg of a human being below the ankle joint