A northeaster in one place may be an easter, a norther, or a souther in some other locality.
Source: wiktionary
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Keep "souther" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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9 total sentences available.
A northeaster in one place may be an easter, a norther, or a souther in some other locality.
Source: wiktionary
Having passed across in sight of this place, the Santa Anna tacked and stood off, as though she were awaiting a pilot, but none appearing, southered her course as if about to proceed down the coast ; having, however, rounded a small island in the river's mouth, covered with lofty trees, which completely concealed their presence, they again anchored.
Source: wiktionary
In that time three other packets loaded, and when the wind southered the four put to sea in company.
Source: wiktionary
Very probably they had already made first nests further north, which had their contents destroyed, and they fled south and were more successful with second broods. The consequence of this southering of breeding birds would in all probability cause a southering of their autumn migration routes;
Source: wiktionary
Showing 4 of 9 available sentences.
Closest matches include easterly, levanter, mistral, north wind, norther.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.