gam / gamy  

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marriage

            monogamy:  one marriage at a time

            polygamy: married to several people at the same time

pluto

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rich

            plutology:  the study of wealth

            plutologist:  an expert in the study of wealth

ultra- 

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extreme  

            ultraism:  extreme beliefs                                   

            ultramodern:  extremely modern

derm / derma / dermato  

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skin

            dermic:  having to do with the skin

            dermoid:  resembling skin

            dermatology:  the study of the skin

cycl / cycle / cyclo  

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circle or cycle~Note: transportation is important

             motorcycle:  a cycle having a motor

             cyclic:  having a cycle or circle

             cycloid:  resembling a circle or cycle