degeneration
definition: passing from a more complex to a simpler biological form
example:
speech part: noun
synonyms:
retrogression
definition: the process of declining from a higher to a lower level of effective power or vitality or essential quality
example:
speech part: noun
synonyms:
devolution
definition: the state of being degenerate in mental or moral qualities
example:
speech part: noun
synonyms:
degeneracy