What's wrong with just being "a club"? Why does everyone have to be a big club or a small club? The whole debate will continue forever because different people have different views on it, some value historical success, some value fanbase, some value recent success, some value spending power etc. The question of historical vs recent success is of particular importance when you look at clubs like Leeds and Forest, both would have been labelled big clubs in the past, but nowadays you will find mixed opinions.
If I was pressed because I tend to favour recent history there are 6 big clubs in England, but I wouldn't describe Newcastle as a small club: MU, MC, Chelsea, Arsenal, Spurs and Liverpool.