Az-Zakah in the language: Growth, purification, refinement of something.
Az-Zakah in the Shariah:
An obligatory portion of a particular wealth for a specific group or way. It was made mandatory in mecca before the hijra and its obligations, portions, and receivers were clarified in Medina. It is one of the pillars of Islam, so if anyone denies its obligation then he is a disbeliever," because he has disbelieved in Allah and his messenger(s)
Whoever accepts its obligation but refuses to pay it due to miserliness or laziness then give him the tidings of a painful torment.
As-Siyaam (Fasting) in the language means: Refraining from a thing.
In the legislation it means refraining from food, drink, and the rest of the nullifiers; from the appearance of the second Fajr to the setting of the sun, in worship of Allaah, the mighty and majestic.
Allaah has obligated fasting upon his slaves within every religion.
Allaah, the exalted, has said: "O You who believe! Observing As-Sawm (the fasting) is prescribed for you is it was prescribed for those before you. That you may become al- muttaqun (pious)".
Other Sources:
Quranic Arabic versus Modern Arabic - Similarities and Differences
A Muslim's guide to overcoming depression and distressing situations
