different between nascency vs incipiency

English

nascency (countable and uncountable, plural nascencies)

A state of incipiency; a quality of nascence.
- 1889, William James and James Ward, "The Psychological Theory of Extension," Mind, vol. 14, no. 53, p. 108:
  [W]e are, therefore, sure in advance, of being right, if we say of any perception that first it didn't exist, and that then there was a mere suggestion and nascency of it, which grew more definite, until, at last, the thing itself was fully established.

incipiency (countable and uncountable, plural incipiencies)

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