No, it isn't. If you mean rabble, as in disorganized crowd, then maybe... it comes close. Rubble though is just a bunch of broken rocks, and wouldn't qualify as an antonym.
Yes, the noun 'squadron' is a collective noun for:a squadron of cavalrya squadron of planesa squadron of fighter planesa squadron of jetsa squadron of swans
squadron Flotilla, Squadron......
The noun 'squadron' is a singular, common, concrete noun; a word for a military group; a word for a thing.The noun 'squadron' is a standard collective noun for:a squadron of aeroplanesa squadron of cavalrya squadron of fighter planesa squadron of flying fisha squadron of jetsa squadron of planesa squadron of shipsa squadron of swan
6 Squadron RAF Leuchars3 Squadron RAF Coningsby17 Squadron RAF Coningsby29 Squadron RAF Coningsby11 Squadron RAF Coningsby
The collective noun is a squadron of airplanes or a squadron of fighter planes.
617 Squadron
617 Squadron of the Royal Air Force is better known as the "Dambusters" squadron
Maintenance Squadron (MXS)
No
A squadron of swans is one of the collective nouns for swan; others are a bank, a bevy, a drift, a herd, a sownder, a team, or a wedge of swans. The collective noun squadron is also for a squadron of airplanes or a squadron of fighter planes.
squadron Flotilla, Squadron......