Dark web is tor/i2p et al (usually just referring to tor hidden services). Deep web is the segment of the normal WWW not indexed by search engines - internal company stuff behind logins, cloud storage, private forums etc.
That said, yeah, the two are mixed up and used interchangeably all the time. But they are separate concepts.
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I've never heard of an intranet being referred to as the deep web. That seems odd.
afaik, "deep web" is used for all the http traffic that is not web browsing such as all http API and the such
