Work; labor — the physical or mental work someone does.
今日の働きはこれで終わりです。
That's the work for today; we're finished.
この工場では肉体的な働きが多い。
There is a lot of physical labor at this factory.
季節によって農家の働きは変わる。
Farmers' work changes depending on the season.
Achievement; performance; the ability or effect someone/something shows (contribution or impact).
彼女の働きはチーム全体の士気を高めた。
Her performance raised the morale of the whole team.
その研究者の働きが新薬の開発につながった。
The researcher's work led to the development of a new drug.
彼の言葉には人の心を動かす働きがある。
His words have the power to move people's hearts.
Salary; income — a less common usage where '働き' refers to pay or earnings.
季節労働者の働きは日当で支払われることが多い。
Seasonal workers' pay is often paid as a daily wage.
今年は働きが少なく、貯金が減った。
My earnings were low this year, so my savings decreased.
Action; activity; function — the operation or role something performs.
酵素の働きで糖が分解される。
Sugars are broken down by the action of enzymes.
このボタンの働きは電源を切ることだ。
The function of this button is to turn off the power.
社会全体の働きが改善すれば、生活が楽になる。
If the functioning of society as a whole improves, life will become easier.
In linguistics: conjugation/inflection — referring to how a word functions or is inflected.
言語学では語の働きや活用の仕方を詳しく調べる。
In linguistics we investigate in detail a word's function and how it inflects.