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Googling, I see many places using the spelling commerical, but I don't see that spelling in any dictionaries at all. Is it a mistake for commercial, or are these two different words?

In virtually all cases, commerical is simply a misspelling of commercial. (Your question is a rare—and perhaps only—example where it is not!).

Many of the hits that show up in the google search you linked to are obviously misspellings of commercial. Consider this one, for example. The title says Commerical DNA Testing, but in the text it says To order tests, download the AGA Commercial DNA Testing form and follow these instructions. Similarly here: commerical in the title, but commercial in the text.

Let's also look at the twitter hashtag #commerical. Again, most of the tweets there clearly meant commercial but misspelled it. This is particularly clear in cases where the word commercial appears in the body of the tweet, e.g. here. Some tweeter users have pointed out such mistakes, e.g. this one. One tweeter user, 'Roto-Rooter Plumbing', frequently tweets both with #commercial and with #commerical (see here), but I can't see any difference between the two sets of posts.

In short, while it's hard to prove a negative, what I've seen so far leads me to believe that commerical is in virtually all cases simply a misspelling of commercial (there is at least one exception: your question). So far I see no evidence that commerical is some sort of neological portmanteau of commercial and comical.

What if commerical were a real word (which it does not appear to be)

Having said all that, Hot Licks's comment is correct (even if it was meant mostly as a joke) when it says that commerical could be such a portmanteau. In fact, there are arguably situations in which it can be quite tempting to think that commerical could be such a portmanteau, for example when considering odd, surprising, or funny facts having to do with commercial activity or with advertisement. For example, this page is about an unexpected fact concerning retail, and it originally contained the typo commerical. In the comments, we find the following exchange:

A commenter:

Commerical = Commercial + Comical

or just a typo?

The blogger:

Typo. Will fix.

The commenter was confused because, in the particualar context of that blog post, it was entirely believable that someone could invent and use such a portmanteau, and moreover it is more or less clear what it would mean if it were used.

(At this point one may do a google search for 'commerical AND comical' to see if anyone commented on such usage. There are only 162 hits as of the time of this writing, and so it is possible to scan them all. I've done this, and it seems that in all of them commerical is a typo after all. This strengthens the case for claiming that commerical is always a typo.)

So let me try to flesh out what the meaning of commerical might be if it were a real word. It would probably be an adjective, and it might denote several different things.

One possibility would be a humorous commercial (advertisement). Sample usage: that new commerical Pepsi advertisement uses humor to good advantage.

Another meaning could be some action that some business took that inadvertently turned out to be funny in an embarrassing way. Sample usage: They tried to appear serious in their sales pitch, but their presentation ended up being a prime example of a commerical misstep.

To repeat, I see no evidence that commerical actually is used by anyone in either of the ways presented above. And I don't think it will be, for the simple reason that commerical and commercial are simply too similar and so too easily confused when written (though, admittedly, not when they are spoken).

"Commerical" is a typo for "commercial". Link.

From the Cambridge dictionary:

related to buying and selling things

Example uses:

Unlike the other commercial states of the 7th and 6th centuries B.C.,
e.g.

Then I got smart and checked all non-commercial vehicles.

In addition to the storage buildings, he owns an insurance agency, a bank
and a bunch of commercial real estate.

"Commerical" as found by your Google link, is a typing error for "commercial".