1: ἐκκλησία
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(Strong's #1577 — Noun Feminine — ekklesia — ek-klay-see'-ah )

is translated "congregation" in Hebrews 2:12 , RV, instead of the usual rendering "church." See ASSEMBLY.

2: συναγωγή
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(Strong's #4864 — Noun Feminine — sunagoge — soon-ag-o-gay' )

is translated "congregation" in Acts 13:43 , AV (RV, "synagogue"). See SYNAGOGUE.