... being adjectives vs. ... are adjectives

I asked:

1. try your best --> 'best' here is a noun.
2. try your level best--> 'best' here is an adjective. (try your level which is best)

Am I right?

???

Rover_KE replied:

IMO, 'best' is still a noun in #2.
Also: your very best — level and best being adjectives.

???

I asked:

Why not 'level and very are adjectives'?

???

Rover_KE replied:

That would work, but rephrasing and punctuation would need to be changed.

'You can also say "your very best". "Level" and "very" are adjectives in this context.'

My first version was shorter.

???

I asked:

Thank you. But I don't understand why the following isn't correct. I think
this sentence is grammatical, isn't it? (A dash can be followed by a
sentence.)

Also: your very best — level and very are adjectives.

Or did Rover_KE just want a phrase rather than a sentence?

Did Rover_KE's phrase mean the following?

... level and very (which are) being adjectives.

???

Originally from https://goo.gl/Qb72Lt

Why do I post it here again? Because it didn't get answered.