a coarse classification of naming conventions(patterns) within the Emacs ecosystem

syntactic              : char, word, line, sentence, paragraph, region, page,
                        sexp, list, defun,
emacs-specific         : register, rect, buffer, mode, frame, window,
font                   : face, font
filesystem             : file, dir,
location and direction : beginning, end, forward, backward, next, previous, up, down,
action                 : search, goto, kill, delete, mark, insert, yank, fill, indent, find, view, describe, change, set,
misc                   : case, what, default.