The headword and the two initial glosses are nominative singular. Perhaps quoted from somewhere (see n. 1 below) or perhaps a generic lexical reference.
[1] cf. Synagoge phi219, Hesychius phi983 (which Latte regards as a gloss on Demosthenes 29.23). The first glossing synonym suggenh/s, which does not appear in these other lexica, is generally treated in other sources as distinct from and less inclusive than the headword: so e.g. Aristophanes, Birds 368; Aristotle, Nicomachean Ethics 1165a.
[2] Josephus, Jewish Antiquities 5.299, with minor modification (see web address 1). Here the genitive plural form of the headword noun occurs. For Sampson cf. sigma 87, sigma 88.