Information on the word 'scower'

Solution 1:

I would like some more explanation on this [scower vs scour].
Why is the word 'obsolete' as well as not being more widely used?

The explanation is actually very simple. Scower is not an obsolete word; as you point out, it's still used. Rather, it's an obsolete Spelling. There's only one verb with those meanings, it's pronounced /skawr/, and it's usually spelled scour. But it has also been spelled scower, and that's the way you apparently learned to spell it. English spelling is commodious enough to provide several convenient spellings for just about any word, and often does.

Spelling a word differently does not change the word; it's still the same word.
Spelling is orthography, which is technological. Language, by contrast, is natural.