1: ἀγών
(Strong's #73 — Noun Masculine — agon — ag-one' )

is translated "race" in Hebrews 12:1 , one of the modes of athletic contest, this being the secondary meaning of the word. See CONFLICT.

2: στάδιον
(Strong's #4712 — Noun Neuter — stadion — stad'-ee-on )

"a stadium," denotes a "racecourse," 1—Corinthians 9:24 . The stadium (about 600 Greek feet or 1/8 of a Roman mile) was the length of the Olympic course. See FURLONG.