1: κῶλον
(Strong's #2966 — Noun Neuter — kolon — ko'-lon )

primarily denotes "a member of a body," especially the external and prominent members, particularly the feet, and so, a dead body (see, e.g., the Sept., in Leviticus 26:30; Numbers 14:29,32; Isaiah 66:24 , etc.). The word is used in Hebrews 3:17 , from Numbers 14:29,32 .

2: πτῶμα
(Strong's #4430 — Noun Neuter — ptoma — pto'-mah )

see BODY , No. 3.