Princeton's WordNet

1. foot, human foot, pes(noun)

   the part of the leg of a human being below the ankle joint

   Synonyms:
   fundament, understructure, base, foot, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

2. foot, ft(noun)

   a linear unit of length equal to 12 inches or a third of a yard

   Synonyms:
   fundament, understructure, base, foot, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

3. foot(noun)

   the lower part of anything

   Synonyms:
   fundament, understructure, base, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

4. animal foot, foot(noun)

   the pedal extremity of vertebrates other than human beings

   Synonyms:
   fundament, understructure, base, human foot, infantry, ft, foundation, metrical unit, metrical foot, groundwork, substructure, foot, invertebrate foot, pes, animal foot

   Antonyms:
   head

5. foundation, base, fundament, foot, groundwork, substructure, understructure(noun)

   lowest support of a structure

   Synonyms:
   metrical unit, bottom, foundation garment, founding, tail, groundwork, pes, al-Qaida, instauration, butt, pedestal, substructure, posterior, rear end, infantry, introduction, can, ft, nates, al-Qaeda, theme, basis, innovation, fundament, invertebrate foot, nucleotide, foundation, buttocks, prat, radical, root, animal foot, floor, stern, metrical foot, seat, foot, backside, bum, tooshie, grounding, buns, arse, institution, hindquarters, tail end, behind, origination, understructure, alkali, cornerstone, base, hind end, derriere, rump, ass, home, keister, stem, base of operations, radix, root word, stand, rear, fanny, human foot, infrastructure, tush, initiation, al-Qa'ida, creation, bag

   Antonyms:
   head

6. foot, invertebrate foot(noun)

   any of various organs of locomotion or attachment in invertebrates

   Synonyms:
   fundament, understructure, base, foot, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

7. foot(noun)

   travel by walking

   Synonyms:
   fundament, understructure, base, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

8. foot(noun)

   a member of a surveillance team who works on foot or rides as a passenger

   Synonyms:
   fundament, understructure, base, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

   Antonyms:
   head

9. infantry, foot(noun)

   an army unit consisting of soldiers who fight on foot

   Synonyms:
   fundament, understructure, base, human foot, infantry, ft, foundation, metrical unit, metrical foot, groundwork, substructure, foot, invertebrate foot, pes, animal foot

   Antonyms:
   head

10. metrical foot, foot, metrical unit(noun)

    (prosody) a group of 2 or 3 syllables forming the basic unit of poetic rhythm

    Synonyms:
    fundament, understructure, metrical foot, human foot, infantry, ft, foundation, base, groundwork, substructure, foot, invertebrate foot, pes, metrical unit, animal foot

    Antonyms:
    head

11. foot(verb)

    a support resembling a pedal extremity

    Synonyms:
    fundament, understructure, base, human foot, infantry, ft, foundation, metrical foot, groundwork, substructure, metrical unit, invertebrate foot, pes, animal foot

    Antonyms:
    head

12. foot, pick(verb)

    pay for something

    Synonyms:
    foot, clean, leg it, pick, beak, pluck, nibble, hoof, foot up, find fault, hoof it, plunk, blame, piece, break up, peck, cull

    Antonyms:
    head

13. foot, leg it, hoof, hoof it(verb)

    walk

    Synonyms:
    foot up, pick, foot, leg it, hoof it, hoof

    Antonyms:
    head

14. foot, foot up(verb)

    add a column of numbers

    Synonyms:
    foot up, pick, foot, leg it, hoof it, hoof

    Antonyms:
    head