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Anduin

Sindarin: Anduin ‘Long River’ (as also known in English, German)

and S – long E
duin S – (large) river E
and + duin → anduin

References: Case-sensitive: LR(92), LR/Index(32), FR(17), TT(20), RK(23), S(28), UT(75), IV(1), V(3), VI(2), VII(88), VIII(92), IX(9), X(4), XI(5), XII(72) Case-insensitive: VII(1)

English: Great River

References: Case-sensitive: H(2), LR(48), FR(25), TT(17), RK(6), S(9), UT(4), IV(1), V(1), VI(15), VII(44), VIII(16), IX(1), XI(5), XII(4) Case-insensitive: H(2), LR(1), FR(1), S(5), UT(2), II(2), IV(3), V(3), VI(1), VII(5), X(2), XI(5), Etym.(1)

English: Anduin the Great

English: Great River of Wilderland

German: Großer Fluss ‘Great River’

References: Verified: LRde

Langflood

Anduin / Langflood / Great River — Tolkien Gateway

Anduin, The Great River — The Thain's Book

Anduin / River Anduin, The Great River. — Encyclopedia Arda

Great River, The River Anduin. — Encyclopedia Arda

Langflood, The Mannish name for the Anduin. — Encyclopedia Arda