xiphias
xĭphĭas, ae, m., = ξιφίας (swordshaped). A sword-fish: Xiphias gladius, Linn.; Plin. 32, 2, 6, § 15; Ov. Hal. 97. A sword-shaped comet, Plin. 2, 25, 22, § 89.

xiphion
xĭphĭon, ii, n., = ξιφίον, sword-flag, gladiole, Plin. 25, 11, 88, § 137.