I am trying to understand this expression. According to Wikipedia, it is translated as "The Lord is my light".
Before reading this article, I thought this meant "Lord illuminate me", perhaps in imperative mode. In effect, there is such verb - illuminare, and I was trying to find the specific conjugation which would tell me the mode, time, person, etc. But that seem not to exist.
Would my original interpretation be written "Dominus illumina mea"?
More generally, how to precisely differentiate among such words that are both a noun and a verb? Is it plainly obvious that a declinsion "tio" is not a verb? Is there another clue?