Ammonius - Concerning Similar and Different Words

Here we have titled this post after the Greek title of the work which it presents, Περὶ ὁμοίων καὶ διαφόρων λέξεων, although λέξεων can also mean phrase or saying. The brief version of the Latin title is De Differentia Adfinium Vocabulorum, which generally means On the Difference of Related Vocabularies. 

This work is attributed to a certain Ammonius, which is evidently Ammonius Grammaticus, a 4th century AD professor of grammar at Alexandria, and also a pagan Egyptian priest. There is a 15th century manuscript of this work in the Bodleian Library which is catalogued at Oxford University which may give some further summary insight into the work, as it lists other works accompanying it in the same manuscript.

It is of interest to us where it explains the difference between Judaean and Idumaean, citing Ptolemy, the 2nd century AD Greek geographer, and we have written an explanation of that in a comment here: Evidence that the geographer Ptolemy corroborated Strabo on Edom.