Is the suffix OK or the end of OK?
Amazing Near right.
There is no such ending "OK" in Russian.
I think the problem is that some people consider the OK ending in such words as "tetrad-ok, birch-ok print-ok" and the like.
No, this is not an ending, but a suffix after all. As well as "EK" in the word "books".
More in the textbooks of the Russian language.
If the word ends with some sounds, transmitted in the letter by letters, this does not mean that the "last in line" is the end. The ending is zero, and what stands in front of it is anything.
- Angle: Here -Angle is the root, -ox is the suffix, and the ending is zero.
- Keychain: the whole word is a root, there are no suffixes or prefixes, the inflection is zero again. When declining, the vowel O always remains: key fob, key fobs.
- Hot-water bottle: -heat-root, -k- suffix, -a end. In the form of the genus. n. mn warmedca the "ok" slice is a variant of the -k- suffix, scientifically called allomorph.
- OK, coming from American English. This word-sentence is synonymous from time immemorial to the existing "yes". He does not understand the composition in principle.
The ending "ok" in Russian does not exist, if suddenly it appears, the entire Russian-speaking community will be terribly surprised.