SunOS is the UNIX[R] base operating systems by Sun Microsystems Inc.

Solaris is made up of multiple components, namely:
o  The SunOS Operating System
o  A graphical interface
o  Networking capability
o  Plus other bundled products/applications

To simplify your question

    Solaris = SunOS
    2.6       5.6
    7         5.7
    8         5.8
    9         5.9

Sun's knowledge base (SunSolve) has a good InfoDoc #75589 which goes into
more details ... And is available freeley @
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=finfodoc%2F75589&zone_32=75589

HTH ... Schlumpf

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