RE HolidaysSummer.com
Not seeing much value to be honest, sorry. It sounds bad with the words the wrong way around, and has 2 S together, which without the uppercase as you did it looks poor:
holidayssummer.
I don't think you'll sell it.
The other one I have no idea. LLLL and NNNN are selling strong, but none of that may have any bearing on yours, which is entirely different at NLNN.