different between syntropy vs syntrophy

English

syn- +? -tropy

syntropy (uncountable)

(pathology) The coalescence of two diseases into one
(psychology) A wholesome association with others
(anatomy) A formation of a series of similar parts having the same orientation (such as the ribs)

syn- +? -trophy

syntrophy (countable and uncountable, plural syntrophies)

(biology) The relationship between the individuals of different species (especially of bacteria) in which one or both benefit nutritionally from the presence of the other

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