pes vs human foot

pes and human foot both are nouns.

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

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

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

Other synonyms of pes include foot.

pes (noun)	human foot (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