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I think it could be a root word.
-logy means "the study or science of".
There are no words that start with "logy", except for the word "logy".However, many words start with the suffix "-logy" or "the study of", including biology, glaciology, geology, paleontology, pathology, and entomology.
Some nouns with the suffix -logy are:
answ2. logy as in biology, geology metrology etc means study of. Related to the word logic.