We all know there is a word 'anymore' in English. But is 'somemore' or 'severalmore' exist in English? Why or why not?
Actually, we do not all know there is a word 'anymore' in English. It is an American dialect word which would not be commonly written or consider correct in other English dialects. It would be vocalised but written as two words.
The dialect contraction is one of many contractions using the prefix "any". Common forms are anyone, anybody, anyhow, anything, anywhere. You cannot make new contractions just using the postfix of "more", and as the contraction is a regional dialect, the chances of it occurring in written text are thus low. Further, current spell-checkers would flag it and deter writers from using them.
My spell checker flags anymore as incorrect, for example.