Usage: 3 forms in 5 verses
Form Translated As     In Verse(s)
λέξισ speech LXX.Job.36.2
λέξιν form of speech LXX.Esth.3.12LXX.Esth.8.9
their form of speech LXX.Esth.1.22
λέξεωσ speech LXX.Job.38.1

Liddell-Scott-Jones

λέξις (lexis) form of speech G:N-F

λέξις, εως, ,

(λέγω B) speech, opposed to ᾠδή, [Refs 5th c.BC+]; λ. πρᾶξις speech or action, [Refs]; τὰ λέξει δηλούμενα orders given by word of mouth, [Refs 2nd c.AD+]

__2 diction, style, ἐνθάδε λ. the style used here (in courts of justice), [Refs 5th c.BC+]; Μούσης λ. poetical diction, [Refs 4th c.BC+]; περὶ Λέξεως, title of work by Ephorus, [Refs 1st c.AD+]
__II a single word or phrase, [Refs 4th c.BC+]; even a meaningless word, such as βλίτυρι, [Refs 4th c.BC+]; αὐταῖς λέξεσι or κατὰ λέξιν word for word, [Refs 1st c.BC+] Rose, etc.; collectively, κρατῶ καὶ τῆς λ. the very words, [Refs 4th c.BC+]
__II.2 κατὰ λέξιν as the phrase goes, [Refs 1st c.AD+]; παρὰ λέξιν incorrectly, [Refs 1st c.BC+]
__II.3 Grammars, a word peculiar in form or signification: hence λέξεις is the older term for a glossary, Ῥοδιακαὶ λέξεις a glossary of Rhodian phrases, [Refs 2nd c.AD+]
__II.4 text of an author, opposed to exegesis, [Refs 2nd c.AD+]