toe vs big toe

toe and big toe both are nouns.

Word	Noun	Adjective	Verb	Adverb
toe	Yes	No	Yes	No
big toe	Yes	No	No	No

As nouns, big toe is a hyponym of toe; that is, big toe is a word with a more specific, narrower meaning than toe:

Other hyponyms of toe include great toe, hallux, hammertoe, little toe.

toe (noun)	big toe (noun)
the part of footwear that provides a covering for the toes	the first largest innermost toe
(golf) the part of a clubhead farthest from the shaft
one of the digits of the foot
forepart of a hoof

toe (verb)	big toe (verb)
touch with the toe
hit (a golf ball) with the toe of the club
drive obliquely
drive (a golf ball) with the toe of the club
walk so that the toes assume an indicated position or direction