The second form is the proper {form} as passive participle; from H5414; one {given} that {is} (in the plural only) the {Nethinim} or Temple Servants (as given up to that duty): - Nethinims.
A primitive root; to flow forth (literally or figuratively); by implication to liquefy: - {drop} gather ({together}) {melt} pour ({forth} out).
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Ezr 7:24Also we certify you, that touching any of the priests and Levites, singers, porters, NethinimsH5412, or ministers of this house of God, it shall not be lawful to impose toll, tribute, or custom, upon them.