The -ade suffix: What do lemonade, grenade, pomade, and crusade have in common? I've read entries from several dictionaries about the *-ade* suffix in English. 

Most of them mention that -ade (or ade) as a drink comes from lemonade, a word that English borrowed from French, and that particular use means "a drink made with fruit juice." 

But "lemonade" itself is often mentioned as one of a number of French words that English borrowed, along with things like pomade, grenade, crusade, arcade, balustrade, accolade, etc. 

What I can't quite figure out from these entries: What do all these words have in common? What is the *-ade* ending designating — or is there no single, uncomplicated definition at all? 