subception vs sense datum

subception and sense datum both are nouns.

Word	Noun	Adjective	Verb	Adverb
subception	Yes	No	No	No
sense datum	Yes	No	No	No

As nouns, sense datum is a hypernym of subception; that is, sense datum is a word with a broader meaning than subception:

subception: (psychology) perception of or reaction to a stimulus that occurs without awareness or consciousness.
sense datum: an unelaborated elementary awareness of stimulation

Other hypernyms of subception include aesthesis, esthesis, sensation, sense experience, sense impression.

subception (noun)	sense datum (noun)
(psychology) perception of or reaction to a stimulus that occurs without awareness or consciousness.	an unelaborated elementary awareness of stimulation