They are two entirely different humanoid species, originating from different planets and distinct physiologies. Klingons can generally be said to be more reptile-like and durable as a whole, with redundancies in their Biology for their physically combative culture. Romulans take to combat in a much more roundabout way, that a Klingon may describe as cowardly, as they have a strong tendency to sneak and ambush in both literal and metaphorical senses.
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Well, the Kingons got their warbird technology from the Romulans, so it's an even match. But if you ask a Klingon, they'll say a Klingon warbird would win and if you ask a Romulan, they'll say a Romulan warbird will win. I am a Klingon, so I say a Klingon warbird would win.
Romulan.
Romulan was created in 1966.
They were overseeing trials of the "alternate reality" Genesis Device!! Starfleet was in the Laurentian system because they have been searching for the rouge Romulan ship that destroyed the USS Kelvin for 25 years. After the Klingons lost 47 war birds to the same ship, Starfleet and the Klingon Empire made a temporary alliance to hunt down and destroy the Romulan threat. It is unknown if Nero contacted the current Romulan Star Empire, but the Federation and Klingons agreed that the Romulans must not receive any technological advantage from Nero's ship.
Its just like boggle but in the Klingon language, and yes Klingon is a language it was developed over the years by the Klingon language institute