1: χαλκός
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(Strong's #5475 — Noun Masculine — chalkos — khal-kos' )

primarily, "copper," became used for metals in general, later was applied to bronze, a mixture of copper and tin, then, by metonymy, to any article made of these metals, e.g., money, Matthew 10:9; Mark 6:8; 12:41 , or a sounding instrument, 1—Corinthians 13:1 , figurative of a person destitute of love. See Revelation 18:12 . See MONEY.

2: χάλκεος
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(Strong's #5470 — Adjective — chalkeos — khal'-key-os )

"made of brass or bronze," is used of idols, Revelation 9:20 .

3: χαλκίον
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(Strong's #5473 — Noun Neuter — chalkion — khal-kee'-on )

is used in Mark 7:4 of "brazen vessels."

4: χαλκολίβανον
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(Strong's #5474 — Noun Neuter — chalkolibanon — khal-kol-ib'-an-on )

is used of "white or shining copper or bronze," and describes the feet of the Lord, in Revelation 1:15; 2:18 .

5: χαλκεύς
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(Strong's #5471 — Noun Masculine — chalkeus — khalk-yooce' )

denotes "a coppersmith," 2—Timothy 4:14 .