Saurian

"Their leader, who was bedecked in feathers, edged towards me. It was I who spoke first. "Salaam brother, we come in peace!" He spoke to me in his own tongue which I could not understand. It was time to delcare the reason for our entry into his land before they decided to attack us..."

—Extract from Ibn Jellba's Expedtion to Zlatlan, circa. 1150 IC

The Lizardmen langauge known as Saurian is a primeval repitilean tongue. It is almost unpronouncable for any race other than the Lizardmen to speak, due in part because it contains so many unique sounds that can't be spoken in other tongues. Only a Lizardmen can voice these or interpret them as words or sentences. The Lizardmen's written language is composed upon glyphs chiseled unto bare stone or gold. It is doubtful whether the Saurian tongue was spoken by the Old Ones as they probably communicated with the Slann by means of telepathy. As such, many scholars believe that the Saurian language is one unique to the Lizardmen.

Dialects
There are currently three dialects of the Saurian language, which is divided between the three main core species. The language of the Slann is the most eloquent form of Saurian. However, the Slann rarely bother to speak it. They can communicate with each other by means of telepathy and so restrict their speech to dictating their prophecies to the Skink scribes and issuing their directives. The Slann's use of words are usually reduced to a bare mininum of words and are enigmantic to say the least. As such, it is the Skinks duty to interpret its meaning.[4m]

The Skinks are the most vocal of the Lizardmen race as they are the builders and crafters of their society. They speak a dialect known as Skinkian, and as such do most of the talking and all of the reading and writing. They do not speak fast, but in long sentences laboriously constructed in a low, kroaking tone. They use much gesticulation to help communicate because all Saurian words are vague in precise meaning and yet must be used to convey the profound thoughts of their masters, the Slann.[4m]

Crude Saurian is the dialect of Saurian spoken by the Saurus and to an extent the Kroxigors. The Saurus are not really capable of pronouncing many words at all. They are far better at fearsome roars and blood-curdling battlecries then actual speech. When they do speak in Saurian, it often comes out deep and harsh. As such, most of their vocabularly is limited to only fifty or so words that is mostly associated with fighting. It is their leaders job then to string these words into coordinated orders and battleplans for their cohorts.

Source
Warhammer Armies: Lizardmen (5th Edition) pg. 28