Headcanon voice cast:

Rahaen'Enriov D'trel ir'Aehallah tr'Rihannsu, CO, ch'M'R Kholhr: Linda Hamilton circa Terminator 2

First Omek'ti'kallan, XO, ch'M'R Kholhr: Chiwetel Ejiofor

Enarrain Daysnur, chief engineer, ch'M'R Kholhr: Alan Tudyk

Zel, tactical officer, ch'M'R Kholhr: Kevin Michael Richardson

Science Bekk Min'tak'allan, sensor officer, ch'M'R Kholhr: Wil Wheaton

Khre'Riov Morgaiah ir'Sheratan t'Thavrau, CO, ch'M'R Aen'rhien: Dina Meyer

Riov Sarsachen i'Amriel tr'Sauringar, XO, ch'M'R Aen'rhien: Christopher Eccleston

Arrain Sahuel i'Tlhira t'Khnialmnae, tactical officer, ch'M'R Aen'rhien: Daniela Ruah

Lieutenant Commander Jaleh Khoroushi, operations officer and Starfleet liaison, ch'M'R Aen'rhien: Naz Deravian

Enarrain Braeg ir'Nequencia tr'Yalu, science officer, ch'M'R Aen'rhien: Chow Yun-Fat

Doctor Emira i'Kallia t'Vraehn, CMO, ch'M'R Aen'rhien: Parminder Nagra

Erei'Riov Tovan ir'Hfihar tr'Khev, chief of security, ch'M'R Aen'rhien: Jon Huertas

Fvillhu Velal i'Ra'tleihfi tr'Hrienteh, head of state of the Romulan Star Empire: Stephen Yoakam

Ekhifv Temjahaere D'tan, head of state of the Romulan Republic: Vidal Peterson

Khre'Enriov Klau tr'Kererek, supreme commander of the Romulan Republican Force: Tom Selleck

Deihu Hannam t'Hei: Salli Richardson

Colonel Merik tr'Kiell, CO, ch'R Sienov: Terence Stamp

General Brokosh, Flag Officer-in-Command, Klingon Sixth Fleet: Murphy Guyer

Captain Koren, daughter of Grilka, CO, IKS bortaS'qu: Secunda Wood


Rihan language glossary, taken or developed from the Imperial Romulan Language Institute:

ahlh aehallhai: profanity

amnhhei'saenhe: tactical officer

Areinneye: Hell. "Urru Areinneye!" = "Go to Hell!"

arrain: military rank, equivalent to a Starfleet lieutenant (OF-3)

ataen: profanity

au'e: emphatic "yes"

Bah'jorha: Bajoran

bedah: formal farewell

Bhorgsu: Borg

Card'hassinsu: Cardassians (sing. Card'hassinha); see also ch'Card'hass

ch'Card'hass: Cardassia Prime (lit. "[planet] of the Cardassians")

ch'Mol'Rihan: New Romulus (lit. "[planet] of the New Declared")

ch'Rihan: Romulus (lit. "[planet] of the Declared")

D'Nneikha: the Dominion (lit. "great empire")

daie: "aye, sir"

deihu: senator (lit. "elder"), Romulan legislator

Deihuit: Senate, Romulan legislature

ehkifv temjahaere: Proconsul, head of state of the Romulan Republic

enarrain: military rank, equivalent to a Starfleet lieutenant commander (OF-4)

enriov: military rank, equivalent to a Starfleet admiral (OF-9)

erei'enriov: military rank, equivalent to a Starfleet vice admiral (OF-8)

erei'riov: "subcommander", equivalent to a Starfleet commander (OF-5)

erein: military rank, equivalent to a Starfleet ensign (OF-1)

fvadt: profanity, akin to "damn"

fvillhu: Praetor, head of government of the Romulan Star Empire

galae: "fleet", but referring to Romulan adoption of massed airpower after settling Romulus, rather than being a maritime allusion. One might infer that Romulan space navies have more in common with the US Air Force than the Navy.

Galae s'Kreh'dhhokh Mol'Rihan: Romulan Republican Force (lit. "New Romulan Republic Fleet), naval service of the Romulan Republic

Galae s'Shiar Rihan: Romulan Imperial Fleet, naval service of the Romulan Star Empire

gonaiih: helmsman or conn officer

Ghorrnha: Gorn (adj. Ghorrn, pl. Ghorrnsu)

Havranha: Reman (adj. Havran, pl. Havrannsu)

hevam: human (derogatory, akin to calling a black guy the n-word; pl. Hevammsu)

ie: "yes" (general-purpose)

ih'hwi'saenhe: first officer or executive officer

jolan'tru: semiformal greeting/farewell, akin to Hawaiian "aloha"

Khe'lloann'na: Klingon (colloquial, lit. "more of them, from somewhere else", due to circumstances of first contact with the Federation; adj. Khe'lloann, pl. Khe'lloann'nasu)

Khiu'draao s'Shiar: Imperial Army, ground military service of the Romulan Star Empire

khnai: "thank you", superior to inferior

khre'enriov: "supreme commander", military title akin to Commander-in-Chief of the Federation Starfleet (in real-world terms, comparable to the Chief of Naval Operations prior to the Goldwater-Nichols Act)

khre'riov: "subadmiral" (lit. "commander-general"), military rank akin to Starfleet commodore or rear admiral (OF-1)

Klivam: Klingon (derogatory; pl. Klivammsu)

Klling'hannha: Klingon (formal; adj. Klling'hann, pl. Klling'hannsu)

Kreh'dhhokh Mol'Rihan: [New] Romulan Republic

leih: commanding officer

Letheha: Lethean

llhai / llhei: "sir"/"ma'am" (honorific for non-military superior)

Lloann'mhrahel: United Federation of Planets (colloquial, lit. "them, from there", due to circumstances of first contact)

Lloannen'galae: Federation Starfleet

mnhei'sahe: Lit. "Ruling Passion", the Romulan concept of "honor". Out-of-universe, based heavily on the ancient Roman value "gravitas". Has a lot to do with saving and maintaining face.

rahaen'enriov: "high admiral", akin to Starfleet fleet admiral (OF-10)

rekkhai: non-gendered address to military superior, akin to Starfleet "sir"

Rihanha: Romulan (adj. Rihan, pl. Rihannsu; Rihanh = "the Romulan people")

rh'Rhiyrh: Empress, head of state of the Romulan Star Empire (defunct)

riov: "commander", akin to Starfleet captain (OF-6)

shaoi ben: formal hello, superior to inferior

shaoi kon: formal hello, inferior to superior

Shiar ih'Saeihr Rihan: Romulan Star Empire

Tal'Diann: Romulan Military Intelligence, akin to Starfleet Intelligence (or in real life, the Office of Naval Intelligence) as the internally operated intelligence service of the Romulan military. Name used for functionally identical agencies in both the Empire and the Republic. Overshadowed by the Tal'Shiar.

Tal'Shiar: Imperial Secret Service, former paramilitary intelligence service, secret police, and ideological enforcement arm of the Romulan Star Empire (no direct Earth analogue; they're sort of an amalgamation of the KGB + popular perception of Communist Party political officers + Waffen-SS). As of 2409, effectively a state unto itself, no longer fully controlled by the Imperial government.

Terrhaha: human, from "Terran" (adj. Terrhain, pl. Terrhasu)

Tholinsu: Tholians (adj. Tholin, sing. Tholinha)

uhlan: military rank, akin to Starfleet enlisted rate of crewman or petty officer

Undinnsu: Undine (adj. Undin, sing. Undinha)