Some titles are a mission statement. More Fun Comics not only describes the content but consorts with the consumer to insist that they have 'more fun'. Hyperbole is a broadbased feature of the comic book but not every title has followed this patina quite so closely.
Other golden age titles like Pep Comics are similar in tone. They are specific in their promise, if not their description of character types or genre.
A series entitled Justice Society of America did not appear until thirty years after the more junior team, Justice League of America. Characters in those days sprang through the pages of generic titles that promised action and adventure, romance and mystery. Amazing Mystery Funnies was both a title to live up to and live down, but it could swap its heroes and stories around to its heart's content (its content's heart)
Remember in all this that some interesting characters have never had their own book. They feature either in titles that encompass a group or larger gathering of heroes, or in generic titles like Tales to Astonish. Comics can have titles as prosaic as that for newspapers or as descriptive as magazines. Unlike some books, the titles tend to be short and to the point. It is the individual titles that bear a closer resemblance to titles given to plays and that is because they deal with one storyline, rather than a continuing saga or standalone stories featuring a common character. Film and radio series are further media whose titling is not that dissimilar to comic book series.
The comics industry knows which side its bread is buttered on and, besides bolstering its titles with fetching adjectives (and there is some justification for calling a character who goes on getting stronger the angrier he gets 'incredible'), it also makes its appeal direct to collectors and fans. A skill for well chosen titles is a valuable talent to master.