language and subdialects
I can't remember details from when I read the books but since the Kilrathi are (to a fair degree) based on the Kzinti (of the Larry Nivens Man-Kzin Wars series) they would probably share a degree of the language sub-types.
Unless your specifically trying to mention it in a story/fanfic for talking bits, most people generally leave this kind of thing out and/or write it off as "best translation for alien speech parts" or "correct dialect and tones not used for simplicity of reading"
each major clan has its own slightly different dialect
also there are sub-dialects depending on the situation, who the speaker is, etc
---DIALECTS---
-self to royalty/nobility
-self to religious (example: talking to a Priest of the Fanged God, Priestess of Sivar, etc)
-self to superior (by military or social rank)
-self to inferior (by military or social rank)
-self to crowd (example; group briefings, various meetings, etc)
-self to other-clan/non-kilrathi/outsiders/dishonored ones/nameless ones/prisoners/slaves/etc
---TONES---
-tone of equals (rarely used... examples; Thrakhath to his sister, two captains of equal rank, etc)
-questioning tone (nearly identical to insulting tone)
-insulting tone
-mocking tone (used for insults)
-respectful tone
-imperative tone (typically used when giving orders)
---SUB LANGUAGES---
-Female's Tongue (used by semi-sentient kzinti females and for ordering them around, may be a version that the fully-sentient kilrathi females among the Sutagi Clan
-- not sure I spelled the clan name right... its the one major clan that's mostly females
and mostly Priestesses of Sivar)
-Slave's Tongue (used by slaves since they can't pronounce the "heroes tongue" very well)