Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Thyatīra, ae, f., = Θυάτειρα, a town of Lydia, now Ak-hissar, Liv. 37, 44, 4; Plin. 5, 29, 31, § 115; also, Thyatīra, ōrum, n., Liv. 37, 8, 7.
Hence, Thyatīrēni, ōrum, m., the inhabitants of Thyatira, Plin. 5, 30, 33, § 126.