No, the channel name NBCSN is an acronym (form made from initial letters of a name or phrase).
The full form, National Broadcasting Network Sports Network, is a proper noun.
No. It is not an adjective. An adjective describes something.
Yes, it is an adjective.
No it's not a adjective, an adjective is a describing word.
Yes, it is an adjective. it is the comparative form of the adjective 'scary.'
The adjective is cloudless. It describes the sky.
Yes. NBCSN is channel 603 on DirecTV.
channel 146
Channel502
yes
100
Channel 549.
408
265
259
327
4
146