A — 1: κιθάρα
(Strong's #2788 — Noun Feminine — kithara — kith-ar'-ah )

whence Eng., "guitar," denotes "a lyre" or "harp;" it is described by Josephus as an instrument of ten strings, played by a plectrum (a smaller instrument was played by the hand); it is mentioned in 1—Corinthians 14:7; Revelation 5:8; 14:2; 15:2 .

B — 1: κιθαρίζω
(Strong's #2789 — Verb — kitharizo — kith-ar-id'-zo )

signifies "to play on the harp," 1—Corinthians 14:7; Revelation 14:2 . In the Sept., Isaiah 23:16 .