Boyd’s Bible Dictionary:
(board). Primitive tables were merely leather or skins spread on the floor. After the captivity they were slightly raised. Beds or couches are meant (Mark 7:4); writing tablet of wax (Luke 1:63). The “tables” (Matt. 21:12; John 2:15), were doubtless sufficiently raised to answer the purposes of a counter for money-changing purposes. The meaning of “serve tables” (Acts 6:2), is that duty which fell to the early Christian ministry of attending to the gathering and distributing of food to the poor, or of collecting and distributing the church funds. This duty was transferred to the deacons (Acts 6:5-6).
“Bank (τράπεζα)” From Concise Bible Dictionary:
This is literally a table, and mostly so translated, and which could be used for any purpose (Luke 19:23). In Matthew 25:27 a kindred word is translated “exchangers”; both passages imply that there were in those days, as now, those who received and lent money on interest.
“Table” From Concise Bible Dictionary:
In a few places this term refers to a tablet which could be written on, (Hab. 2:2; Luke 1:63; 2 Cor. 3:3). In Mark 7:4 the word translated “table” is κλίνη, “a couch,” often translated “bed” in the AV.
Strong’s Dictionary of Greek Words:
Meaning:
probably contracted from 5064 and 3979; a table or stool (as being four-legged), usually for food (figuratively, a meal); also a counter for money (figuratively, a broker's office for loans at interest)
KJV Usage:
bank, meat, table