1: δύναμις
(Strong's #1411 — Noun Feminine — dunamis — doo'-nam-is )

"power, inherent ability," is used of works of a supernatural origin and character, such as could not be produced by natural agents and means. It is translated "miracles" in the RV and AV in Acts 8:13 (where variant readings give the words in different order); 19:11; 1—Corinthians 12:10,28,29; Galatians 3:5; AV only, in Acts 2:22 (RV, "mighty works"); Hebrews 2:4 (RV, "powers"). In Galatians 3:5 , the word may be taken in its widest sense, to include "miracles" both physical and moral. See MIGHT , A, No. 1, POWER, WORK.

2: σημεῖον
(Strong's #4592 — Noun Neuter — semeion — say-mi'-on )

"a sign, mark, token" (akin to semaino, "to give a sign;" sema, "a sign"), is used of "miracles" and wonders as signs of Divine authority; it is translated "miracles" in the RV and AV of Luke 23:8; Acts 4:16,22; most usually it is given its more appropriate meaning "sign," "signs," e.g., Matthew 12:38,39 , and in every occurrence in the Synoptists, except Luke 23:8; in the following passages in John's Gospel the RV substitutes "sign" or "signs" for the AV, "miracle or miracles;" John 2:11,23; 3:2; 4:54; 6:2,14,26; 7:31; 9:16; 10:41; 11:47; 12:18,37; the AV also has "signs" elsewhere in this Gospel; in Acts, RV, "signs," AV, "miracles," in Acts 6:8; 8:6; 15:12; elsewhere only in Revelation 13:14; 16:14; 19:20 . See SIGN , TOKEN , WONDER.