Terms:
Cement
Concrete
Masonry Cement - Portland Cement and Hydrated Lime already blended together 
Mortar
Portland Cement - 
Stucco
The typical concrete mix is made up of roughly 10% cement, 20% air and water, 30% sand, and 40% gravel. This is called the 10-20-30-40 Rule–though proportions may vary depending on the type of cement and other factors. Links:
Concrete Basics: Essential Ingredients For A Concrete Mixture
Type N, S, M Masonry Cement & Mortar - CEMEX USA

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last updated 24 Nov 2015