SQNR and SINAD - what's the difference?

I've learned in some course abouth the SQNR factor of ADC,
SQNR=(k-c)6.02dB+1.76dB+OSR
OSR - over sampling ratio. as OSR gets bigger, it means the over sampling is higher and the SQNR gets better.
K- hardware bits of ADC.
C - constant (0.5 to 1LSB) for the real world calculation.

Now, I've encountered few times in the term SINAD, which looks different than SQNR. Furthermore, in ADC's data sheet, they talk about SINAD and ENOB, and not a word about SQNR.
I'm confused...