1: δέκατος
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(Strong's #1182 — Adjective — dekatos — dek'-at-os )

an adjective from deka, "ten," occurs in John 1:39; Revelation 11:13; 21:20 .

2: δεκάτη
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(Strong's #1181 — Adjective — dekate — dek-at'-ay )

grammatically the feminine form of No. 1, with meris, "a part," understood, is used as a noun, translated "a tenth part" in Hebrews 7:2 , "a tenth," Hebrews 7:4; "tithes" in Hebrews 7:8,9 .