log
Ex: geology

graph/gram
Ex: paragraph

scope
Ex: telescope

photo
Ex: photograph

phon
Ex: phonograph

geo
Ex: geology

tele
Ex: television

phob
Ex: claustrophobia

psych
Ex: psychic

cycl
Ex: bicyle

therm
Ex: thermometer

mech
Ex: mechianical

bio
Ex: biography

chron
Ex: chronological

opt
Ex: optical

cardi
Ex: cardiac

hydr
Ex: hrdrophobic

meter, metr
Ex: meter

phys
Ex: physical