Radical: cord-.
1. core: from cor = the heart: hence, the inner part of a thing.
2. cor'dial, a.: cord + (i)al = having the quality of the heart: hence, hearty, sincere. The noun "cordial" means literally something having the quality of acting on the heart: hence, a stimulating medicine, and in a figurative sense, something cheering.
3. con'cord: con + cord = heart with (con) heart: hence, unity of sentiment, harmony.
OBS.—Concord in music is harmony of sound.
4. dis'cord: dis + cord = heart apart from (dis) heart: hence, disagreement, want of harmony.
5. record': through Lat. v. recordari, to remember (literally, to get by heart): hence, to register.
6. cour'age: through Fr. n. courage: literally, heartiness: hence, bravery, intrepidity.
OBS.—The heart is accounted the seat of bravery: hence, the derivative sense of courage.