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I'm not sure if this question is okay to be posted to ell.se, as I don't know if it is obvious for native speakers or not, that:
physics and mathematics both ends with '-ics', while sociology and psychology end with '-logy'.
definition from dictionary.com:
-logy: a combining form used in the names of sciences or bodies of knowledge;
-ics: a suffix of nouns that denote a body of facts, knowledge, principles, etc.
My current conclusion is that '-ics' is for subjects that involve more practical works, whereas '-logy' is for those who deal with theoretical knowledges.
But 'biology', seemingly, doesn't fit in my conclusion.
2Since the use of -logia and -ika (which eventually turned into -logy and -ics) goes back to Ancient Greek, ELL perhaps is not the best place to ask about the differences, but I am not sure which place I'd recommend, either. – Victor Bazarov – 2015-08-29T16:25:38.187
Note that cinematics, cinematology, and cinematography all seem to mean the same thing. Also note some curious pairs such as physics, physiology, phonetics, phonology, etc. – Damkerng T. – 2015-08-29T16:48:07.530
1I think that is a useful observation of a general trend (also consider -nomy, which suggests quantitative study, and -graphy, which suggests writing and recording), but many subject names are historical choices and do not really fit into the patterns. (Additional "curious pairs": astrology / astronomy; ecology / economy / economics) – Wim Lewis – 2015-08-29T19:14:32.127
I think this is a good question for ELU. – Dog Lover – 2015-08-30T07:01:03.680
@DogLover Maybe you could flag it for migration. – snailplane – 2015-09-30T07:47:28.693