A string of letters doesn't necessarily make a morpheme simply because more than one word starts with it. eg. "Fresh, free, freckle" don't start with a morpheme 'fre', but "freedom, freeman, freeloader" do start with a morpheme, "free".
Moving to the non-English words, -vert, (to turn) -mit, (with) and -ceive (?), we do get an idea that they have similar meanings.
Consider "conceive, receive, perceive". 'ceive' appears to mean "getting something" a conception is something you get in your mind; reception obviously related to receiving/getting; perceive is to get something through perception, etc. So that is a separate morpheme.
Is there a difference between the texts that I've missed, and that you think is important. Or any follow-up question?
There's sometimes a bit of guessing you have to do. Whereas 'mor' is not a morpheme, 'mort' is, as in, 'mortuary, 'mortician', 'mortified'.