Proving the thousand years of Revelation 20 is exactly 1000 years.
The Greek word chilias "thousand" G5505 is only used in scripture when there is multiples of thousands of something:
Luk_14:31 OrG2228 whatG5101 king,G935 goingG4198 to make warG4820 G1519 G4171 against anotherG2087 king,G935 sitteth not downG2523 G3780 first,G4412 andG2532 consultethG1011 whetherG1487 he beG2076 ableG1415 withG1722 tenG1176 thousandG5505 to meetG528 him that comethG2064 againstG1909 himG846 withG3326 twentyG1501 thousand?G5505
Act_4:4 HowbeitG1161 manyG4183 of them which heardG191 theG3588 wordG3056 believed;G4100 andG2532 theG3588 numberG706 of theG3588 menG435 wasG1096 aboutG5616 fiveG4002 thousand.G5505
1Co_10:8 NeitherG3366 let us commit fornication,G4203 asG2531 someG5100 of themG846 committed,G4203 andG2532 fellG4098 inG1722 oneG3391 dayG2250 three and twenty thousand.G5140 G1501 G5505
Rev_5:11 AndG2532 I beheld,G1492 andG2532 I heardG191 the voiceG5456 of manyG4183 angelsG32 round aboutG2943 theG3588 throneG2362 andG2532 theG3588 beastsG2226 andG2532 theG3588 elders:G4245 andG2532 theG3588 numberG706 of themG846 wasG2258 ten thousand times ten thousand,G3461 G3461 andG2532 thousands of thousands;G5505 G5505
Rev_7:4 AndG2532 I heardG191 theG3588 numberG706 of them which were sealed:G4972 and there were sealedG4972 an hundred and forty and four thousandG1540 G5062 G5064 G5505 ofG1537 allG3956 the tribesG5443 of the childrenG5207 of Israel.G2474
Rev_7:5 OfG1537 the tribeG5443 of JudaG2455 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of ReubenG4502 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of GadG1045 were sealedG4972 twelveG1427 thousand.G5505
Rev_7:6 OfG1537 the tribeG5443 of AserG768 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of NepthalimG3508 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of ManassesG3128 were sealedG4972 twelveG1427 thousand.G5505
Rev_7:7 OfG1537 the tribeG5443 of SimeonG4826 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of LeviG3017 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of IssacharG2466 were sealedG4972 twelveG1427 thousand.G5505
Rev_7:8 OfG1537 the tribeG5443 of ZabulonG2194 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of JosephG2501 were sealedG4972 twelveG1427 thousand.G5505 OfG1537 the tribeG5443 of BenjaminG958 were sealedG4972 twelveG1427 thousand.G5505
Rev_11:13 AndG2532 the sameG1565 hourG5610 wasG1096 there a greatG3173 earthquake,G4578 andG2532 theG3588 tenth partG1182 of theG3588 cityG4172 fell,G4098 andG2532 inG1722 theG3588 earthquakeG4578 were slainG615 of(G3686) menG444 sevenG2033 thousand:G5505 andG2532 theG3588 remnantG3062 wereG1096 affrighted,G1719 andG2532 gaveG1325 gloryG1391 to theG3588 GodG2316 of heaven.G3772
Rev_14:1 AndG2532 I looked,G1492 and,G2532 lo,G2400 a LambG721 stoodG2476 onG1909 theG3588 mountG3735 Sion,G4622 andG2532 withG3326 himG846 an hundred forty and four thousand,G1540 G5062 G5064 G5505 havingG2192 hisG848 Father'sG3962 nameG3686 writtenG1125 inG1909 theirG848 foreheads.G3359
Rev_14:3 AndG2532 they sungG103 as it wereG5613 a newG2537 songG5603 beforeG1799 theG3588 throne,G2362 andG2532 beforeG1799 theG3588 fourG5064 beasts,G2226 andG2532 theG3588 elders:G4245 andG2532 no manG3762 couldG1410 learnG3129 that songG5603 butG1508 theG3588 hundred and forty and four thousand,G1540 G5062 G5064 G5505 which were redeemedG59 fromG575 theG3588 earth.G1093
Rev_21:16 AndG2532 theG3588 cityG4172 liethG2749 foursquare,G5068 andG2532 theG3588 lengthG3372 (G848) isG2076 as largeG5118 asG3745 theG3588 breadth:G4114 andG2532 he measuredG3354 theG3588 cityG4172 with theG3588 reed,G2563 twelveG1427 thousandG5505 (G1909) furlongs.G4712 TheG3588 lengthG3372 andG2532 theG3588 breadthG4114 andG2532 theG3588 heightG5311 of itG846 areG2076 equal.G2470
Yet when the number is only one single thousand of something or one thousand plus another number that's less than two thousand, the Greek word chilioi G5507 is used:
2Pe_3:8 But,G1161 beloved,G27 be not ignorantG2990 G3361 of thisG5124 one thing,G1520 thatG3754 oneG3391 dayG2250 is withG3844 the LordG2962 asG5613 a thousandG5507 years,G2094 andG2532 a thousandG5507 yearsG2094 asG5613 oneG3391 day.G2250
Rev_11:3 AndG2532 I will giveG1325 power unto myG3450 twoG1417 witnesses,G3144 andG2532 they shall prophesyG4395 a thousand two hundred and threescoreG5507 G1250 G1835 days,G2250 clothedG4016 in sackcloth.G4526
Rev_12:6 AndG2532 theG3588 womanG1135 fledG5343 intoG1519 theG3588 wilderness,G2048 whereG3699 she hathG2192 a placeG5117 preparedG2090 ofG575 God,G2316 thatG2443 they should feedG5142 herG846 thereG1563 a thousand two hundred and threescoreG5507 G1250 G1835 days.G2250
Rev_14:20 AndG2532 theG3588 winepressG3025 was troddenG3961 withoutG1854 theG3588 city,G4172 andG2532 bloodG129 cameG1831 out ofG1537 theG3588 winepress,G3025 even untoG891 theG3588 horseG2462 bridles,G5469 by the space ofG575 a thousand and six hundredG5507 G1812 furlongs.G4712
Rev_20:2 AndG2532 he laid hold onG2902 theG3588 dragon,G1404 that oldG744 serpent,G3789 whichG3739 isG2076 the Devil,G1228 andG2532 Satan,G4567 andG2532 boundG1210 himG846 a thousandG5507 years,G2094
Rev_20:3 AndG2532 castG906 himG846 intoG1519 theG3588 bottomless pit,G12 andG2532 shut him up,G2808 G846 andG2532 set a sealG4972 uponG1883 him,G846 thatG2443 he should deceiveG4105 theG3588 nationsG1484 noG3361 more,G2089 tillG891 theG3588 thousandG5507 yearsG2094 should be fulfilled:G5055 andG2532 afterG3326 thatG5023 heG846 mustG1163 be loosedG3089 a littleG3398 season.G5550