1: ἐλάχιστος
(Strong's #1646 — — elachistos — el-akh'-is-tos )

"least," is a superlative degree formed from the word elachus, "little," the place of which was taken by mikros (the comparative degree being elasson, "less"); it is used of (a) size, James 3:4; (b) amount; of the management of affairs, Luke 16:10 (twice); 19:17, "very little;" (c) importance, 1—Corinthians 6:2 , "smallest (matters);" (d) authority: of commandments, Matthew 5:19; (e) estimation, as to persons, Matthew 5:19 (2nd part); 25:40,45; 1—Corinthians 15:9; as to a town, Matthew 2:6; as to activities or operations, Luke 12:26; 1—Corinthians 4:3 , "a very small thing."

2: ἐλαχιστότερος
(Strong's #1647 — Adjective — elachistoteros — el-akh-is-tot'-er-os )

a comparative degree formed from No. 1, is used in Ephesians 3:8 , "less than the least."

3: μικρός
(Strong's #3398 — Adjective — mikros — mik-ros', mik-rot'-er-os )

"small little," is translated "the least" in Acts 8:10; Hebrews 8:11 , with reference to rank or influence. See LITTLE , A, No. 1.

4: μικρός
(Strong's #3398 — Adjective — mikroteros — mik-ros', mik-rot'-er-os )

the comparative of No. 3, is used of (a) size, Matthew 13:32 , AV, "the least," RV, "less;" Mark 4:31 [cp. No. 1 (a)]; (b) estimation, Matthew 11:11; Luke 7:28 , AV, "least," RV, "but little," marg., "lesser" (in the kingdom of heaven), those in the kingdom itself being less than John the Baptist [cp. No. 1 (e)]; Luke 9:48 . See LESS.

1—Corinthians 6:4ACCOUNT. Luke 19:421—Corinthians 9:2Acts 5:15