Åh, är det så... tack. That sounds like the Spanish ser vs. estar, but with haber instead.
Aha, so that's where the French vague comes from -- both from Old Norse. The word for "wave" in the other Romance languages is from the Latin unda, but French had more Norse/Norman influence.
Hej! Are there many words like "våg" which have a plural in "-or", though they do not end with "-a"?