A — 1: χάρις
(Strong's #5485 — Noun Feminine — charis — khar'-ece )

for the meanings of which see GRACE , No. 1, is rendered "thank" in Luke 6:32-34; in Luke 17:9 , "doth he thank" is lit., "hath he thanks to;" it is rendered "thanks (be to God)" in Romans 6:17 , RV (AV, "God be thanked"); "thanks" in 1—Corinthians 15:57; in 1—Timothy 1:12; 2—Timothy 1:3 , "I thank" is, lit., "I have thanks;" "thankworthy," 1—Peter 2:19 , AV (RV, "acceptable"). See ACCEPT , D, No. 2.

A — 2: εὐχαριστία
(Strong's #2169 — Noun Feminine — eucharistia — yoo-khar-is-tee'-ah )

eu, "well," charizomai, "to give freely" (Eng., "eucharist"), denotes (a) "gratitude," "thankfulness," Acts 24:3; (b) "giving of thanks, thanksgiving," 1—Corinthians 14:16; 2—Corinthians 4:15; 9:11,12 (plur.); Ephesians 5:4; Philippians 4:6; Colossians 2:7; 4:2; 1—Thessalonians 3:9 ("thanks"); 1—Timothy 2:1 (plur.); 4:3,4; Revelation 4:9 , "thanks;" Revelation 7:12 .

B — 1: εὐχαριστέω
(Strong's #2168 — Verb — eucharisteo — yoo-khar-is-teh'-o )

akin to A, No. 2, "to give thanks," (a) is said of Christ, Matthew 15:36; 26:27; Mark 8:6; 14:23; Luke 22:17,19; John 6:11,23; 11:41; 1—Corinthians 11:24; (b) of the Pharisee in Luke 18:11 in his self-complacent prayer; (c) is used by Paul at the beginning of all his Epistles, except 2Cor. (see, however, eulogetos in 2—Corinthians 1:3 ), Gal., 1Tim., 2Tim. (see however, charin echo, 2—Timothy 1:3 ), and Titus, (1) for his readers, Romans 1:8; Ephesians 1:16; Colossians 1:3; 1—Thessalonians 1:2; 2—Thessalonians 1:3 (cp. 1—Thessalonians 2:13 ); virtually so in Philemon 1:4; (2) for fellowship shown, Philippians 1:3; (3) for God's gifts to them, 1—Corinthians 1:4; (d) is recorded (1) of Paul elsewhere, Acts 27:35; 28:15; Romans 7:25; 1—Corinthians 1:14; 14:18; (2) of Paul and others, Romans 16:4; 1—Thessalonians 2:13; of himself, representatively, as a practice, 1—Corinthians 10:30; (3) of others, Luke 17:16; Romans 14:6 (twice); 1—Corinthians 14:17; Revelation 11:17; (e) is used in admonitions to the saints, the Name of the Lord Jesus suggesting His character and example, Ephesians 5:20; Colossians 1:12; 3:17; 1—Thessalonians 5:18; (f) as the expression of a purpose, 2—Corinthians 1:11 , RV; (g) negatively of the ungodly, Romans 1:21 . "Thanksgiving" is the expression of joy Godward, and is therefore the fruit of the Spirit (Galatians 5:22 ); believers are encouraged to abound in it (e.g., Colossians 2:7 , and see C, below).

B — 2: ἐξομολογέω
(Strong's #1843 — Verb — exomologeo — ex-om-ol-og-eh'-o )

in the Middle Voice, signifies "to make acknowledgement," whether of sins (to confess), or in the honor of a person, as in Romans 14:11; 15:9 (in some mss. in Revelation 3:5 ); this is the significance in the Lord's address to the Father, "I thank (Thee)," in Matthew 11:25; Luke 10:21 , the meaning being "I make thankful confession" or "I make acknowledgment with praise." See CONFESS , No. 2, CONSENT, PROMISE.

B — 3: ἀνθομολογέομαι
(Strong's #437 — Verb — anthomologeomai — anth-om-ol-og-eh'-om-ahee )

"to acknowledge fully, to celebrate fully (anti) in praise with thanksgiving," is used of Anna in Luke 2:38 .

Hebrews 13:15 CONFESS
C — 1: εὐχάριστος
(Strong's #2170 — Adjective — eucharistos — yoo-khar'-is-tos )

primarily, "gracious, agreeable" (as in the Sept., Proverbs 11:16 , of a wife, who brings glory to her husband), then "grateful, thankful," is so used in Colossians 3:15 .