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alcoholism
Terrorism
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Ism Ism - 1979 was released on: USA: 1979
Organism has a 'ism' on the end but organ doesn't
colloquialism
Your question belies the answer! Terrorism!
In Urdu grammar, there are primarily three types of "ism-e-nakra" (indefinite nouns): "ism-e-nakra khas" (specific indefinite), "ism-e-nakra aam" (general indefinite), and "ism-e-nakra mutlaq" (absolute indefinite). Ism-e-nakra khas refers to specific items, while ism-e-nakra aam refers to general categories. Ism-e-nakra mutlaq is used for non-specific references. Each type serves a different function in conveying meaning and context in sentences.
The Thin Blue Line - 1995 Ism Ism Ism 2-2 is rated/received certificates of: UK:PG (video rating) (1997)
Organism has a 'ism' on the end but organ doesn't
"ism" means "a distinctive practice, system, or philosophy, typically a political ideology or an artistic movement." (mac osx dictionary) so many topics in philosophy (like rationalism) are labeled by patterns of thinking about ideas see http://phrontistery.info/isms.html and http://en.wikipedia.org/wiki/-ism for good lists.