1: ἀποδίδωμι
(Strong's #591 — Verb — apodidomi — ap-od-eed'-o-mee )

"to give back, to render what is due, to pay," used of various obligations in this respect, is translated "to pay, to make payment," in Matthew 5:26; 18:25 (twice),26,28,29,30,34; 20:8; RV (AV, "give"). See DELIVER.

2: τελέω
(Strong's #5055 — Verb — teleo — tel-eh'-o )

"to bring to an end, complete, fulfill," has the meaning "to pay" in Matthew 17:24; Romans 13:6 . See ACCOMPLISH.

Romans 23:23Hebrews 7:9TITHE.