Nowadays, SunOS is the operating system that forms a part of the Solaris operating environment. A so-called Solaris system is in fact running a SunOS kernel. Vis:

# uname -a
SunOS sappa01z 5.7 Generic_106541-12 sun4u sparc SUNW,Ultra-Enterprise-10000

Note what the first word says. This domain is running Solaris 7.

Before the release of Solaris as a bundled operating environment, SunOS was a BSD style unix. With the release of Solaris came the switch to a SYSV style.

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