Antonyms for stags

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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR STAGS

But his most notorious attempt of this order, was a four-in-hand of stags.

Stags abounded, and Rose ceased to ask why so many of them stood at bay.

He overcame him in the end with a weapon made of stags' antlers.

A herd of eighty stags in the distance had been imagined to be hostile warriors.

The same may take place in regard to the horns of Stags and Rein-deer.

And so the stags eyed each other, getting more angry all the while.

He was always glad to see the locked antlers of the two stags.

“Come, we must now show you the way we hunt with our stags,” said the khan.

The stags are mostly by themselves at this season, for the does are with their young calves.

What is the rule for forming such a plural as stags from stag?