selection vs excerption

selection and excerption both are nouns.

Word	Noun	Adjective	Verb	Adverb
selection	Yes	No	No	No
excerption	Yes	No	No	No

As nouns, excerption is a hyponym of selection; that is, excerption is a word with a more specific, narrower meaning than selection:

As nouns, selection and excerption are synonyms defined as:

Other synonyms of selection include excerpt, extract.

selection (noun)	excerption (noun)
the act of choosing or selecting	The act of excerpting or selecting from a larger work.
the person or thing chosen or selected	a passage selected from a larger work
a passage selected from a larger work
an assortment of things from which a choice can be made
a natural process resulting in the evolution of organisms best adapted to the environment