supplementation vs subjunction

supplementation and subjunction both are nouns.

Word	Noun	Adjective	Verb	Adverb
supplementation	Yes	No	No	No
subjunction	Yes	No	No	No

As nouns, supplementation and subjunction are synonyms defined as:

Other synonyms of supplementation include subjoining.

supplementation (noun)	subjunction (noun)
the act of supplementing	the act of supplementing
a quantity added (e.g. to make up for a deficiency)