pyr / pyro   

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fire

            pyrgeometer - device which measures earth’s/Earth’s heat
            pyrology - the study of fire

-en  (suffix @ the end)   

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 (A.)     (adj) = made of

~ part of speech change: noun or adjective + en  =  adjective                        woolen - made of wool (noun wool + en = adjective made of wool)
wooden - made of wood (noun wood + en = adjective made of wood)                

(B.)      (v.) = to make

~ part of speech change: adjective + en  =   verb

          moisten - to make moist ( adjective moist + en = verb to make moist)
           soften - to make soft (adjective soft + en = verb to make soft)

chrom / chromato  

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color or using color                              

   ~spelling chromato = chromat + vowel

            chromatology - the study of colors
            chromotherapy - treatment using colors

gy / gyny / gyneco      

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woman                                                              

Note:  also gyno / gynae / gynaeco

            gynecologist – an expert in the study of women
            polygynous - having to do with many women

lith / litho   

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rock                                                                              ~spelling  litho  =   lith + vowel

            polylithic - having to do with many rocks
            lithology - the study of rocks            

- al /- ical  

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having to do with           

Notice:  ical  =  ic + al

            gastral - having to do with the stomach
            anthropoidal - having to do with resembling early man