Noun: A heteromorph is a word that sounds similar to another word and can even carry the same meaning as the original word depending on how one understands it. Yet it is always spelled differently and may sound slightly different then the original word.
Study the case of abominable vs. abonginable.
"I found that snow man you built to be quite abonginable especially when you put that black pipe in its mouth," Jack said.
"You really know how to use a heteromorph in a sentence don't you Jack," Jill responded.